Table of Contents
DOK-CONTRL-S20*SYS*INS-AP02-EN-P
IndraControl S20 System and Installation
10
Process, parameter, and diagnostic data
10.1
Process data
10.2
Parameter and diagnostic data (PDI channel)
The IndraControl S20 local bus is used for the transmission of process data and
parameter data.
IndraControl S20 devices have at least eight bits of process data. If less than eight
bits are used, they occupy the least significant bits of the byte.
The significance of the data corresponds to the Motorola format (Big Endian).
The significance of the data bytes declines as the number goes up.
For the process data assignment and the assignment of the process
data to the terminal points of a module, please refer to the module-spe-
cific data sheet.
Parameter and diagnostic data as well as other information is transmitted via the
PDI channel (PDI = Parameters, Diagnostics, and Information).
The PDI channel is used in addition to the process data channel in the
IndraControl S20 system for the demand-oriented, acyclic transmission of param-
eter and diagnostic data as well as other information. Each IndraControl S20 I/O
module has this channel and can use it independently of the process data.
Services can be used to access communication objects created in the
IndraControl S20 I/O module via the PDI channel. These objects can be used, for
example, to set measuring ranges, to specify the substitute value behavior of out-
puts in the event of a bus error, or to read I/O diagnostic details.
In most cases, the objects are accessed automatically, e.g., when writing the start
parameterization during the bus coupler's startup.
The objects created in the IndraControl S20 I/O module are:
•
General standard objects (index 0001
Every I/O module has these objects.
For more detailed information on these objects, please refer to
eral standard objects" on page
•
Manufacturer-specific application objects (index 0080
)
hex
These objects are specified by the device manufacturer and have device-
specific variables.
For more detailed information on these objects, please refer to the module
documentation.
You can access these objects using services.
Service
Meaning
Read
Reading an object
Table 10-1
Services
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Process, parameter, and diagnostic data
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