ABB AC 800M User Manual
  1. Manuals
  2. Brands
  3. ABB Manuals
  4. Controller
  5. AC 800M
  6. User manual

ABB AC 800M User Manual

Profibus dp
Show thumbs Also See for AC 800M:
1
2
3
4
Table Of Contents
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
Table of Contents

Quick Links

See also: Installation Manual
AC 800M
PROFIBUS DP
Installation
System Version 5.0, 5.1
Power and productivity
for a better world
TM
Table of Contents
loading

Related Manuals for ABB AC 800M

Summary of Contents for ABB AC 800M

  • Page 1 AC 800M PROFIBUS DP Installation System Version 5.0, 5.1 Power and productivity for a better world...
  • Page 3 AC 800M PROFIBUS DP Installation System Version 5.0, 5.1...
  • Page 4 In no event shall ABB be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, nor shall ABB be liable for incidental or consequential damages arising from use of any software or hard- ware described in this document.

  • Page 5: Table Of Contents

    Transmission Technology Overview ................22 FISCO (Fieldbus Intrinsically Safe Concept)..............23 Section 2 - Transmission Technology RS485 Transmission Technology ..................25 AC 800M and CI854(A)..................25 RS485 cable type and speed.................26 RS485 network limits...................28 Adding field devices to the RS485 network............30 RS485 cycle time calculation................31 RS485 installation recommendation ..............32...
  • Page 6 Table of Contents MBP network limits..................... 35 MBP power and line length calculation............... 36 Adding field devices to the MBP network............38 MBP cycle time calculation ................. 39 PROFIBUS DP/PA Linking Device LD 800P ............. 40 Fibre Optic Transmission Technology ................42 Fibre optics cable type and speed ................
  • Page 7 Fieldbus Topologies with fibre optics................84 Bus length and speed....................84 Optical link modules and AC 800M in a star topology........85 Optical link modules and AC 800M in a ring topology ........87 Redundancy concepts ......................89 RLM 01 - Redundancy Link Module..............92 Section 4 - Commissioning of PROFIBUS equipment Installation of data cables ....................93...
  • Page 8 Table of Contents 3BDS009029R5001 B...

  • Page 9: About This User Manual

    Design of a plant and the cable laying regulations • Commissioning and testing of PROFIBUS equipment For a list of documentation related to ABB PROFIBUS products, please see the Released User Manuals and Release Notes on page 14. 3BDS009029R5001 B...

  • Page 10: How To Use This User Manual

    2. This chapter is intended for readers, they know PROFIBUS basics and need an introduction to install PROFIBUS networks in connection with the AC 800M controller and the PROFIBUS master interface CI854(A). Also the readers get recommendations and important hints for installation work.

  • Page 11: Terminology

    About This User Manual Terminology Electrical warning icon indicates the presence of a hazard that could result in electrical shock. Warning icon indicates the presence of a hazard that could result in personal injury. Caution icon indicates important information or warning related to the concept discussed in the text.
  • Page 12 ABB. AC 800M Controller Any controller constructed from the units and units connected to the AC 800M hardware platform. Connector A Connector is a coupling device used to connect the wire medium to a fieldbus device or to another segment of wire.
  • Page 13 About This User Manual Terminology Term/Acronym Description Transmission technology Manchester Coding and Bus Powered. This term replaces the previously common terms for intrinsically safe transmission “Physics in accordance with IEC 61158-2, 1158-2, etc. Non Return to Zero, a protocol behavior of the MBP transmission technology.

  • Page 14: Released User Manuals And Release Notes

    • Included on the documentation media provided with the system and published to ABB SolutionsBank when released as part of a major or minor release, Service Pack, Feature Pack, or System Revision. •...
  • Page 15 About This User Manual Released User Manuals and Release Notes For standards and commercially available PROFIBUS documentation please visit the PROFIBUS Web Site (http://www.profibus.com) 3BDS009029R5001 B...
  • Page 16 Released User Manuals and Release Notes About This User Manual 3BDS009029R5001 B...

  • Page 17: Section 1 Introduction

    Due to its high data transmission rates over short distances and moderate ones over long distances it is predominantly used for interconnecting I/O units like S800 / S900 or smart devices to PLCs and controller like AC 800M. This user manual provides a brief overview of the PROFIBUS technology, to help you by planning, commissioning and testing.

  • Page 18: The Profibus Protocols

    The PROFIBUS Protocols Section 1 Introduction The PROFIBUS Protocols PROFIBUS is a manufacturer-independent fieldbus standard for applications in manufacturing, process and building automation. PROFIBUS technology is described in fixed terms in DIN 19245 as a German standard and in EN 50170 / IEC 61158 as an international standard.
  • Page 19 Section 1 Introduction The PROFIBUS Protocols Only the two protocol types DP and PA today are important for process automation and are supported within the 800xA System. Figure 1. The PROFIBUS family embedded in Industrial IT PROFOBUS DP: the bus for the Decentralized Periphery The PROFIBUS DP (RS485) is responsible for communication between the Controller level of a process automation system and the decentralized periphery in the field, also intrinsic safety (RS485-IS) via DP-Ex barriers into hazardous area.

  • Page 20: Profibus Technology Terms

    PROFIBUS Technology Terms Section 1 Introduction It correspond to IEC Standard 61158-2 and can be also applied to intrinsically safe installations (EEx i) in Zone 1 / Div.1. Linking Devices are used to integrate PA bus lines into the PROFIBUS DP network. This ensures that all information is available in a continuously connected network through the complete PROFIBUS system (DP and PA).
  • Page 21 PROFIBUS DP is a fast and deterministic process data exchange between a PROFIBUS master and the assigned slave devices. Presently the basic and extended functions supported with AC 800M/CI854(A) are: • Basic function (V0): –...

  • Page 22: Transmission Technology Overview

    Transmission Technology Overview Section 1 Introduction Transmission Technology Overview Table 1. Transmission technologies at PROFIBUS RS485 RS485-IS Fibre Optic Digital, differential Digital, differential Digital, bit- Optical, digital, NRZ Data signals according to signals according to synchronous, transmission RS485, NRZ RS485, NRZ Manchester coding Transmission 9,6 to 12000 kbit/s...

  • Page 23: Fisco (Fieldbus Intrinsically Safe Concept)

    Section 1 Introduction FISCO (Fieldbus Intrinsically Safe Concept) FISCO (Fieldbus Intrinsically Safe Concept) To render the proof of Intrinsic Safety as simple as possible, the so-called FISCO model was developed. FISCO stands for Fieldbus Intrinsically Safe COncept. The German Federal Physical Technical Institute (PTB) developed the FISCO model and has published it in Report PTB-W-53 "Examination of intrinsic safety for fieldbus systems“.
  • Page 24 FISCO (Fieldbus Intrinsically Safe Concept) Section 1 Introduction – capacitance coating: 80 nF/km < C’< 200 nF/km (including the shield) • Taking the shield into consideration, the capacitance coating is calculated as follows: – C’ = C’conductor/conductor + 0.5 * C’conductor/shield if the bus line is potential free –...

  • Page 25: Section 2 Transmission Technology

    CI854(A) interacts as PROFIBUS master and builds up a PROFIBUS network with RS 485 technology. Up to 12 CI854(A) modules can be placed at one AC 800M Controller and each interface works as a single PROFIBUS master, which can be configured with its own transmission rate.

  • Page 26: Rs485 Cable Type And Speed

    The adjusted speed is valid for all connected devices on the bus, when commissioning the system. A detailed description of the AC 800M and CI854(A) is available in their specific product manuals. RS485 cable type and speed The maximum permissible bus length depends on the transmission rate and the bus cable type.
  • Page 27 Section 2 Transmission Technology RS485 cable type and speed Table 2. Basic data for a PROFIBUS DP reference cable Wire diameter > 0.64 mm Wire cross-section > 0.34 mm Project-specific requirements and limitations such as underground wiring, UV resistance, being free of halogen, etc. should be considered when selecting the cable.

  • Page 28: Rs485 Network Limits

    RS485 network limits Section 2 Transmission Technology Calculation of a bus length against of two transmission rates: A transmission rate of 3 Mbit/s shall be used. The transmission rates in the table close to this value are 1.5 Mbit/s with l and 12 Mbit/s with l .
  • Page 29 Section 2 Transmission Technology RS485 network limits Figure 2. RS485 network limits 3BDS009029R5001 B...

  • Page 30: Adding Field Devices To The Rs485 Network

    Adding field devices to the RS485 network Section 2 Transmission Technology Adding field devices to the RS485 network A shielded twisted-pair copper cable is the hardware required for RS485 transmission. It connects all devices to the bus structure (line). The bus structure allows for non-reactive coupling and decoupling of stations or step wise commissioning of a system.

  • Page 31: Rs485 Cycle Time Calculation

    RS485 cycle time calculation The bus cycle time should be shorter than the AC 800M program cycle time. However, a faster data throughput alone is not enough for successful implementation of a bus network. PROFIBUS DP only requires approx. 1 ms at 12 Mbit/s for the transmission of 512 bits of output data distributed over 32 stations.

  • Page 32: Rs485 Installation Recommendation

    RS485 installation recommendation Section 2 Transmission Technology RS485 installation recommendation Problems with data transmission in PROFIBUS networks can be attributed to incorrect wiring or installation. These problems can often be solved using bus test equipment such as bus monitors, which are able to detect many typical wiring errors even before commissioning.

  • Page 33: Mbp (Iec 61158-2) Transmission Technology

    Section 2 Transmission Technology MBP (IEC 61158-2) Transmission Technology More information about this technology is given in the guidelines and specification from the PROFIBUS International organization (http://www.profibus.com) MBP (IEC 61158-2) Transmission Technology The MBP transmission technology (Manchester Coded, Bus Powered), which is the new naming for the previous designation “IEC 61158-2 Physics”, is mostly used for applications in the process automation with a requirement for bus powering and intrinsic safety of devices.
  • Page 34 MBP cable type and speed Section 2 Transmission Technology Table 4. Basic data for the PROFIBUS PA reference cable Parameter PA, Cable type A Cable design shielded twisted pair Conductor cross section (nominal) 0,8 mm² Loop resistor (direct current) 44 Ohm/km Wave resistance at 31,25 kHz 100 Ohm +20% Wave attenuation at 39 kHz...

  • Page 35: Mbp Network Limits

    Section 2 Transmission Technology MBP network limits MBP network limits The maximum of connected devices per single segment is limited to 32. This is a theoretical value, because this number can be further determined by the protection type selected and the bus power. In intrinsically safe applications the power (maximum voltage and current) is defined with strict limits.

  • Page 36: Mbp Power And Line Length Calculation

    MBP power and line length calculation Section 2 Transmission Technology MBP power and line length calculation The distribution of stations on the PROFIBUS PA segment can have a negative effects on the maximum possible line length in certain circumstances. The following example is intended to clarify this point: Linking Device/...
  • Page 37 Section 2 Transmission Technology MBP power and line length calculation The maximum line length of the PROFIBUS PA segment is calculated as follow: Max. line length = 38 Ohm / 44 (Ohm/km) = 0.863 km Max. line length = 863 m Since in practice the stations are not all connected compactly at the end of the transmission line, the resulting structure is as follows: Linking...

  • Page 38: Adding Field Devices To The Mbp Network

    Adding field devices to the MBP network Section 2 Transmission Technology When selecting the type of line, make certain that for Ex applications the requirements in terms of insulation voltage and single conductor insulation of EN 60079-14 and the characteristic values in accordance with the FISCO model are maintained.

  • Page 39: Mbp Cycle Time Calculation

    Section 2 Transmission Technology MBP cycle time calculation polarized with respect to device power. These devices are designed so that signal polarity and power polarity are the same. Connecting the +DC to the (+) terminal automatically insures correct signal polarity. Non-polar bus powered field devices accept both signal and power of either polarity.

  • Page 40: Profibus Dp/Pa Linking Device Ld 800P

    PROFIBUS DP/PA Linking Device LD 800P Section 2 Transmission Technology • Telegrams with a variable data field (0 to 244 data bytes and 9 to 11 control bytes) • Brief acknowledgement (1 byte) • Token telegram for bus access control (3 bytes) With all data transmissions, the parity and block checking of the telegrams is used to reach a Hamming distance of HD=4, so that up to three errors can be detected with certainty.
  • Page 41 Section 2 Transmission Technology PROFIBUS DP/PA Linking Device LD 800P Figure 8. PROFIBUS DP/PA Linking Device LD 800P LD 800P performs the following tasks: • Potential separation between the PROFIBUS DP and the PROFIBUS PA • Conversion of the RS 485 physical arrangement of the PROFIBUS DP to the physical arrangement based on IEC 61158-2 of the PROFIBUS PA.

  • Page 42: Fibre Optic Transmission Technology

    Fibre Optic Transmission Technology Section 2 Transmission Technology Fibre Optic Transmission Technology Fibre-optic transmission is suitable for use in areas with high electromagnetic interference or where greater network distances are required. The PROFIBUS guideline (2.022) for fibre optic transmission specifies the technology available for this purposes.
  • Page 43 Section 2 Transmission Technology Fibre optics cable type and speed Table 6 shows the different cable types, wave lengths and maximum distances, reachable with the certain fibre media. Table 6. Basic data for fibre optic cable Fibre/Sheath Media Wavelength Max. distance Path attenuation diameter 980/1000 μm 0 ...

  • Page 44: Fibre Optic Network Limits

    There are several RS485/fibre optic converter available from different manufacturer. ABB recommends RS485/fibre optic converter from Hirschmann (OZD Profi 12M) and Phoenix Contact (PSI-MOS-PROFIB/FO). Optical link modules described in this document are based on the Hirschmann RS485/fibre optic converter.

  • Page 45: Monitoring Of The Communication Quality

    Section 2 Transmission Technology Monitoring of the communication quality Monitoring of the communication quality Optical link modules mostly provide segment monitoring at the RS485 and fibre optic port. Power supply One RS485 port Redundant fibre optic port Figure 9. Optical link module with 1 RS485 port and redundant fibre optic ports The following description of monitoring functionality can be build up with the optical link modules from Hirschmann and Phoenix Contact.

  • Page 46: Basics Of Fibre Optics Topology Technologies

    Basics of fibre optics topology technologies Section 2 Transmission Technology • Send echo A frame which is received by a module via any port is transmitted to all other ports. If the receiving port is an optical port, the module sends the frame back to the corresponding optical sender.
  • Page 47 Section 2 Transmission Technology Basics of fibre optics topology technologies Line Topology In a line structure, the individual optical link modules are connected together by dual-fiber optical fibers (transmit/receive fibres). Modules with one optical port are sufficient at the beginning and end of a line, between then modules with two optical ports are necessary.
  • Page 48 Basics of fibre optics topology technologies Section 2 Transmission Technology If a module fails, an optical fiber breaks or faults are determined on the optical transfer link, the fiber link between the two optical link modules is interrupted. The PROFIBUS network is divided into two partial networks, which remain functional independently of one other.
  • Page 49 This ensures that master time-out times which may arise are kept as short as possible in the event of a malfunction. Low bus subscriber addresses are not necessary for the bus configuration with ABB Control IT AC 800M in connection with CI854(A). link monitoring Line topology without optical fiber...
  • Page 50 Basics of fibre optics topology technologies Section 2 Transmission Technology Star Topology In a star structure several optical link modules are combined to form an active PROFIBUS star coupler. Further optical link modules are connected to this by dual- fiber optical fiber lines (transmit/receive fibres). The modules of the star coupler are connected to one another via the electrical port (electrical star segment).
  • Page 51 Section 2 Transmission Technology Basics of fibre optics topology technologies Please take the following recommendations into account: • Ensure that the electrical star segment is wired carefully. Keep it as small as possible to avoid interference injection into the electrical star segment, and from here into the entire network.
  • Page 52 Basics of fibre optics topology technologies Section 2 Transmission Technology Redundant Optical Ring The redundant optical ring structure represents a special form of line topology. A high degree of network operating safety is achieved by ”closing“ the optical line. A redundant optical ring can only be realized with modules supporting two optical ports of the same type.
  • Page 53 Section 2 Transmission Technology Basics of fibre optics topology technologies The segmentation is lifted automatically as soon as both modules recognize that the segmented field bus network is functioning correctly with the help of test frames. The line forms itself into a ring. The ambient conditions described in the topic line technology and the following conditions must be fulfilled to ensure that the network configuration functions correctly:...

  • Page 54: Calculation Of Transmission Delay Time Ttd

    In connection with the AC 800M and CI854(A) the T delay time shall be added to the slot time (TSL) in the CI854(A) settings tab.
  • Page 55 Section 2 Transmission Technology Calculation of transmission delay time TTD Delay time of optical fiber lines The delay time is approx. 5 µs for each km of line. Converted to bit periods this gives: Table 7. Delay times of optical fibre lines Transmission rate in kbit/s Delay time in tbit per km 0.05...
  • Page 56 Calculation of transmission delay time TTD Section 2 Transmission Technology 3BDS009029R5001 B...

  • Page 57: Section 3 Fieldbus Topologies

    Section 3 Fieldbus Topologies Overview Fieldbus systems are used as a means of communications for serial data exchange between decentralized devices on the field level and the controller of the process supervision level. In addition to intelligent Transmitter and Actuators with a direct connection to the fieldbus, intelligent Remote I/Os are also used as interface systems for conventional 4...20 mA or HART field devices to record process data on the field level.
  • Page 58 Overview Section 3 Fieldbus Topologies of each. Not every topology is applicable for each transmission technology like RS485 or fibre optics. Possible topologies for fieldbus networks Figure 13. 3BDS009029R5001 B...

  • Page 59: Point-To-Point Topology

    Section 3 Fieldbus Topologies Point-to-Point Topology Point-to-Point Topology Point-to-Point Topology Figure 14. Point-to-Point Topology means a connection and interaction of only two devices. This topology is mostly used in sub-segments for example to connect HART devices to Remote I/O. For the HART device the remote I/O operates as a master, however the remote I/O is part of the PROFIBUS network.

  • Page 60: Line Topology

    Line Topology Section 3 Fieldbus Topologies Line Topology Line Topology Figure 15. With this topology, the fieldbus cable is routed from device to device on this segment, and is interconnected at the terminals of each fieldbus device. Installations using this topology should use connectors or wiring practices such that disconnection of a single device is possible without disrupting the continuity of the whole segment.
  • Page 61 Section 3 Fieldbus Topologies Line Topology with spurs PROFIBUS provides a wide range of possible transmission rates. The permissible lengths of possible spur cables depend upon the transmission rate used. No spurs are permitted for transmission rates over 1,5 Mbit/s. With transmission rates less than 1,5 Mbit/s the total length of all spur cables should be less than 6,6 m.

  • Page 62: Tree Topology

    Tree Topology Section 3 Fieldbus Topologies Tree Topology Tree Topology Figure 17. With this topology, devices on a single fieldbus segment are connected via individual twisted wire pairs to a common junction box, terminal, or I/O card. This topology can be used at the end of a home run cable as well as in between. It is practical if devices on the same segment are well separated, but in the general area of the same junction box.

  • Page 63: Star Topology

    Section 3 Fieldbus Topologies Star Topology Star Topology Star Topology Figure 18. In a star structure several optical modules (for example optical link modules) are combined to form an active PROFIBUS star coupler. The modules of the star coupler are connected to one another via RS485 (PROFIBUS DP). In opposite to the tree topology the star topology contains more main components to build a structure like a tree.

  • Page 64: Ring Topology

    Ring Topology Section 3 Fieldbus Topologies Ring Topology Redundant ring topology Figure 19. The ring structure represents a special form of the line topology. A high degree of network operating safety is achieved by ”closing“ the line. A redundant ring can be also realized to increase the high availability.

  • Page 65: Fieldbus Topology With Rs485 (Profibus Dp)

    Section 3 Fieldbus Topologies Fieldbus Topology with RS485 (PROFIBUS DP) Fieldbus Topology with RS485 (PROFIBUS DP) Bus length and speed When a PROFIBUS network is installed, boundary conditions of the RS485 transfer technology must be observed. The electrical network uses a shielded, twisted pair cable.

  • Page 66: Bus Termination

    Bus termination Section 3 Fieldbus Topologies Bus termination According to the PROFIBUS set-up instructions, the transmission line must be terminated actively on both ends to minimize line reflections and to ensure quiescent levels on the transmission lines. The RS485 interface operates on voltage differences.

  • Page 67: Bus Connector

    Section 3 Fieldbus Topologies Bus connector Bus connector A bus connector is used to connect the bus cable to the PROFIBUS device. Bus connectors are available with a variety of protection classes and mechanical designs. The choice of connector is mainly determined by the space available in the vicinity of the PROFIBUS device.
  • Page 68 Bus connector Section 3 Fieldbus Topologies transmit signals. The Sub-D plug, connected to the Sub-D connector of the device, needs only the receive and transmit signals for the communication transmission. The connector shown below include a terminating resistor that can be turned on and off.

  • Page 69: Shielding And Data Line Connection

    Section 3 Fieldbus Topologies Shielding and data line connection Shielding and data line connection To prevent EMC interference from entering the device, the cable shield should be connected to the functional ground of the device (generally the electrically conductive case). This is done by connecting the cable shield to the metal case of the Sub-D connector and the functional ground over a large area.

  • Page 70: Rs485 Limits And Network Design

    RS485 limits and network design Section 3 Fieldbus Topologies RS485 limits and network design As described in the PROFIBUS RS485 specification, each bus segment can have a maximum of 32 active devices. In order to be able to connect a larger number of PROFIBUS DP devices, it is necessary to segment the bus.
  • Page 71 Section 3 Fieldbus Topologies RS485 limits and network design Figure 24. RS485 network design with bus termination and repeater 3BDS009029R5001 B...

  • Page 72: Fieldbus Topology With Mbp (Profibus Pa)

    Fieldbus Topology with MBP (PROFIBUS PA) Section 3 Fieldbus Topologies Fieldbus Topology with MBP (PROFIBUS PA) PROFIBUS PA with MBA transmission technology is realized in tree or line structure, and any combination of the two. In the line structure, stations are connected to the trunk cable using T-junctions.

  • Page 73: Bus Length And Speed

    Section 3 Fieldbus Topologies Bus length and speed Bus length and speed A twisted two-wire, shielded copper cable (type A) must be used as the transfer medium. It is also possible to exchange and extend devices during operation. The fixed, uniform transfer rate is 31.25 kBit/s. At this rate, cable lengths per segment of up to 1900 m are possible in non Ex(Haz.) case, or 1000 m in Ex(Haz.) cases.
  • Page 74 Bus length and speed Section 3 Fieldbus Topologies The maximum length of the line is restricted by the type of explosion protection and the drop in current over the bus line. The drop in current may result in a further limitation to the number of subscribers.

  • Page 75: Mbp And Intrinsically Safe Installation

    Section 3 Fieldbus Topologies MBP and intrinsically safe installation MBP and intrinsically safe installation In the past, it was necessary to create time-consuming intrinsic safety audit trails in order to obtain permission to operate plants in Ex (Haz.) areas. Now, thanks to the use of the FISCO model (Fieldbus Intrinsically Safe Concept), you can easily design and operate your PROFIBUS PA system in Ex (Haz.) areas in no time at all.

  • Page 76: Bus Termination

    Bus termination Section 3 Fieldbus Topologies Bus termination The bus segment must be terminated on both ends of the line. According to the FISCO model the termination must conform to the following limits: • 90 Ohm < R < 100 Ohm •...

  • Page 77: Profibus Pa Junctions And Connectors

    Section 3 Fieldbus Topologies PROFIBUS PA junctions and connectors PROFIBUS PA junctions and connectors The PROFIBUS PA T-Connectors are available as Standard and Ex(Haz.) version. They are used for coupling 1 up to 4 transmitters to the PA trunk via spurs. The spurs can optionally be connected by an M 12 connection or directly via the EMC cable gland.
  • Page 78 PROFIBUS PA junctions and connectors Section 3 Fieldbus Topologies • Usage of junction box (T-junction): Figure 28. Junction box (T-junction) The junction box retains its role as a central connection unit to build up a tree topology, where all field devices are connected in parallel. The line topology offers connection points along the field bus cable.

  • Page 79: Shielding And Data Line Connection

    Section 3 Fieldbus Topologies Shielding and data line connection Shielding and data line connection Shielding and grounding rules for MBP transmission technology has the following aspects to consider: • Electromagnetic compatibility (EMC) • Protection against explosion • Protection of people IEC 61158-2 specifies grounding as permanently connected to earth through a sufficiently low impedance and with sufficient carrying capability to prevent voltage build up which might result in undue hazard to connect equipment or people.
  • Page 80 Shielding and data line connection Section 3 Fieldbus Topologies The connections between the cable shield and the metallic housings as well as the connections between the shields of the different cable segments have to be low- impedance (for high frequencies). As far as unshielded devices are connected to a shield cable further methods may be applied to reduce the impact of noise (for example galvanic isolation or filtering).
  • Page 81 Section 3 Fieldbus Topologies Shielding and data line connection If a sufficient potential equalization between the hazardous area and the safe area cannot be guaranteed, the cable shield shall be directly connected to the equipotential bonding earth only in the hazardous area. In the safe area the shield shall be connected to earth through a capacitor.
  • Page 82 Shielding and data line connection Section 3 Fieldbus Topologies The capacitor shall have the following requirements: • solid dielectricum (for example ceramic) • C < 10 nF • isolation voltage > 1,5 kV For PROFIBUS PA only shielded wires should be used. The shield should be hard-grounded at the Linking Device or the power link module and on all field devices.

  • Page 83: Bus Spur Lines

    Section 3 Fieldbus Topologies Bus spur lines Bus spur lines PROFIBUS PA allows spur lines. The length of each spur line is determined by the number of PROFIBUS PA bus elements and by the area of application. The table below is specified for spur length using the MBP transmission technology with 31,25 kbit/s transmission rate: Table 9.

  • Page 84: Fieldbus Topologies With Fibre Optics

    Fieldbus Topologies with fibre optics Section 3 Fieldbus Topologies Fieldbus Topologies with fibre optics Bus length and speed An optical network can be implemented in a bus, star or ring topology using optical link modules. The maximum distance between two optical link modules can be up to 15 km with glass fiber-optic cables, 50 m with plastic fiber-optic cables and with PCF (Polymer Cladded Fiber) up to 300 m.

  • Page 85: Optical Link Modules And Ac 800M In A Star Topology

    Section 3 Fieldbus Topologies Optical link modules and AC 800M in a star topology Optical link modules and AC 800M in a star topology The following diagram shows PROFIBUS DP with a fiber optical link for bridging long distances, for electrical isolation of parts of the system, or as a measure for protecting against lightning.
  • Page 86 Optical link modules and AC 800M in a star topology Section 3 Fieldbus Topologies Figure 31. Fiber optical link for bridging long distances 3BDS009029R5001 B...

  • Page 87: Optical Link Modules And Ac 800M In A Ring Topology

    Section 3 Fieldbus Topologies Optical link modules and AC 800M in a ring topology Optical link modules and AC 800M in a ring topology In comparison to the single-fiber ring, an optical double ring offers greater operating safety. The failure of a fibre optical cable or an optical interface has no effect on the availability of the network since the flow of data in both directions runs through the ring.
  • Page 88 Optical link modules and AC 800M in a ring topology Section 3 Fieldbus Topologies Figure 32. Redundant optical ring 3BDS009029R5001 B...

  • Page 89: Redundancy Concepts

    Section 3 Fieldbus Topologies Redundancy concepts Redundancy concepts Using a redundant PROFIBUS system makes it possible to considerably increase the availability and thus the reliability in comparison with a single system. One particular advantage is scalable redundancy that begins with a redundant PROFIBUS transmission link, continues with a redundant master and ends with a redundant PROFIBUS slave.
  • Page 90 Redundancy concepts Section 3 Fieldbus Topologies Master, Line and Slave Redundancy Figure 34. 3BDS009029R5001 B...
  • Page 91 Redundancy concepts Master redundancy The AC 800M controller is linked to the PROFIBUS master module CI854A. When a CI854A module fails or bus communication is interrupted, the redundancy partner is automatically activated. A CI854A pair balances the data cyclically via the CEX bus.

  • Page 92: Rlm 01 - Redundancy Link Module

    RLM 01 - Redundancy Link Module Section 3 Fieldbus Topologies RLM 01 - Redundancy Link Module The Redundancy Link Module RLM 01 converts two reciprocally redundant PROFIBUS DP/FMS lines into simple, non-redundant A/B lines and vice versa. The module works bidirectionally. It transmits and receives in parallel over both lines. The first incoming plausible data are routed to the output.

  • Page 93: Section 4 Commissioning Of Profibus Equipment

    Section 4 Commissioning of PROFIBUS equipment For commissioning tasks you should also be familiar with all other sections. There are some additional hints about general limitations, cable lengths and laying regulations, bus terminations and spur lines. This must be observed in the planning phase and also during the commissioning phase.
  • Page 94 Installation hints for electrical data cables Section 4 Commissioning of PROFIBUS equipment Preparing a PROFIBUS cable (RS485 and MBP) • Cut the PROFIBUS cable type A to the required lengths. Strip off the insulation from the cable ends. • Observe the manufacturer instructions for the PROFIBUS connector. •...

  • Page 95: Installation Hints For Optical Fibre Cables

    Section 4 Commissioning of PROFIBUS equipment Installation hints for optical fibre cables Installation hints for optical fibre cables • Installation waste must be treated with care • Do not look direct in open fibre ends • Keep fibre optic cable plugs clean •...

  • Page 96: Special Conditions Regarding The Installation Of Profibus Dp

    Special conditions regarding the installation of PROFIBUS DP Section 4 Commissioning of Special conditions regarding the installation of PROFIBUS DP When using PROFIBUS - DP, also in intrinsically safe zones with remote I/O modules, the following conditions regarding screening / earthing have to be observed: •...
  • Page 97 Section 4 Commissioning of PROFIBUS equipment Special conditions regarding the installation of equipotential bonding line must be laid, if possible, in parallel to the data line (e.g.: 16 mm²). Under no circumstances, the line shield must be used as compensating line. •...

  • Page 98: Installation Hints For Ci854(A)

    Installation hints for CI854(A) Section 4 Commissioning of PROFIBUS equipment Installation hints for CI854(A) Use the following procedure to install the CI854(A) (for details see related product documentation): Install a connector on the shielded twisted pair PROFIBUS DP cable. A connector with a switchable built-in bus termination is recommended.

  • Page 99: Installing A Redundancy Link Module Rlm 01

    Section 4 Commissioning of PROFIBUS equipment Installing a Redundancy Link Module RLM 01 Installing a Redundancy Link Module RLM 01 Use the following procedure to install the RLM 01(for details see related product documentation): Connect the redundant PROFIBUS lines are connected to ports A and B. Port M is to be used for the not redundant PROFIBUS line to the master or one of the slaves.

  • Page 100: Installing The Profibus Dp/Pa Linking Device Ld 800P

    Installing the PROFIBUS DP/PA Linking Device LD 800P Section 4 Commissioning of PROFIBUS Installing the PROFIBUS DP/PA Linking Device LD 800P The PROFIBUS module CI854(A) is designed exclusively for the connection of PROFIBUS DP nodes. The Linking Device LD 800P is the interface between the PROFIBUS DP and the PROFIBUS PA.
  • Page 101 Section 4 Commissioning of PROFIBUS equipment Installing the PROFIBUS DP/PA Linking Device Connect the power pack. The watch dog time T is set within the LD 800P to a default value of 5 sec. This setting leads to a 5 sec. watchdog time of all underlying PA slave devices independent of the T settings within the PROFIBUS DP master.

  • Page 102: Active Network Terminator And Repeater

    Active network terminator and repeater Section 4 Commissioning of PROFIBUS equipment Active network terminator and repeater The active network components described below can be used to construct simple or complex PROFIBUS networks, and either electrical cables or optical fibre cables can be used as the transmission medium.
  • Page 103 Section 4 Commissioning of PROFIBUS equipment Active network terminator and repeater increase the distance covered by a PROFIBUS network to 10 km (two-wire cable and 93.75 kBit/s) and the number of stations to 127 (with a maximum of 32 bus connections per segment).

  • Page 104: Grounding, Shields, Polarity

    Grounding, Shields, Polarity Section 4 Commissioning of PROFIBUS equipment Grounding, Shields, Polarity Always observe the following points when installing bus line grounding: • Secure the shield braid using metal cable clamps. • The clamps must fully enclose the shield and make good contact. •...

  • Page 105: Testing The Profibus Bus Cable And Bus Connectors

    Section 4 Commissioning of PROFIBUS equipment Testing the PROFIBUS bus cable and bus Testing the PROFIBUS bus cable and bus connectors The measurements described below allow you to test an installed network and eliminate the most common errors, such as reversal of the cable polarity, open or short circuits of data cables or shield and incorrectly connected terminating resistors.
  • Page 106 Testing the PROFIBUS bus cable and bus connectors Section 4 Commissioning of PROFIBUS Table 10. PROFIBUS DP Connector Designation Description +5 V, supply voltage for terminating resistors – Not Used RxD/TxD-N Receive/Transmit Data N-line (A-line, green) DGND Digital Ground Use an ohmmeter to check the static characteristics of the ready made cable: •...
  • Page 107 Section 4 Commissioning of PROFIBUS equipment Testing the PROFIBUS bus cable and bus The following pictures shows the correct installation as well as the common installation errors. Use an oscilloscope to check the voltage signals on the bus segment: A correct PROFIBUS installation: The measured voltage between the both transmission lines shall be 1,1 V Figure 41.
  • Page 108 Testing the PROFIBUS bus cable and bus connectors Section 4 Commissioning of PROFIBUS One bus termination is not powered (5 V) (or two 390 Ohm resistors are missing): The measured voltage between the both transmission lines is 0,62 V Figure 42. Incorrect terminated PROFIBUS line (termination only on one side) 3BDS009029R5001 B...
  • Page 109 Section 4 Commissioning of PROFIBUS equipment Testing the PROFIBUS bus cable and bus One bus termination is not powered (5 V) (or two 390 Ohm resistors are missing) and one additional bus termination (220 Ohm) placed between the transmission lines: –...

  • Page 110: Tips On The Most Frequently Asked Installation Issues

    Tips on the most frequently asked installation issues Section 4 Commissioning of PROFIBUS Tips on the most frequently asked installation issues Are multiple devices with the default address 126, or with the same address connected to the bus? • Make certain that there are no instances of multiple devices on the bus simultaneously with the same address.
  • Page 111 Where can I buy the correct wire, terminals, terminations, and other items required to install a fieldbus? • ABB offers a complete portfolio of PROFIBUS network components. Please get in contact with your regional sales manager. PROFIBUS International offers additional references to the most comprehensive list of suppliers, devices, services, and other fieldbus related items.
  • Page 112 Tips on the most frequently asked installation issues Section 4 Commissioning of PROFIBUS What happens if the bus gets grounded on one side (or at one end)? • A temporary short to ground may temporarily disrupt the bus, but any errors will be detected and handled by the fieldbus protocol.

  • Page 113: Index

    Index Energy lines AC 800M 25, 91 Active network components Actuators 35, 73 Alternating voltage Fibre Optic Fibre optics FISCO 23, 33 BFOC Full-duplex Bus connector 67 to 68 Bus Powered Bus termination Glass 66, 76 Ground-free Grounding Cable CI854(A)
  • Page 114 Index Line redundancy Line Topology Redundancy 44, 60 Line Topology with spurs Redundancy Link Module Linking Device Remote feeding Repeater RLM 01 92, 99 RS485 RS485-IS Manchester Coded Multi Barrier Shielded twisted pair Shields Number of repeaters Signal refelctions Number of stations Slot time Splice Star coupler...

  • Page 115: Revision History

    Revision History Introduction This section provides information on the revision history of this User Manual. The revision index of this User Manual is not related to the 800xA 5.1 System Revision. Revision History The following table lists the revision history of this User Manual. Revision Description Date...
  • Page 116 Updates in Revision Index B 3BDS009029R5001 B...
  • Page 118 Contact us ABB AB Copyright © 2003-2011 by ABB. Control Systems All Rights Reserved Västerås, Sweden Phone: +46 (0) 21 32 50 00 Fax: +46 (0) 21 13 78 45 E-Mail: [email protected] www.abb.com/controlsystems ABB Inc. Control Systems Wickliffe, Ohio, USA...

Table of Contents