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Replacement of modules on the I/O bus
The I/O-Bus is not designed for plugging and unplugging modules while in operation. If a module is
plugged or replaced while the bus is in operation, the following consequences are possible
•
reset of the station or of the CPU
•
system lockup
Caution: Removal of energized modules is not permitted. All power sources (supply and process
voltages) must be switched off while working on any AC500 system.
Serial interfaces of the CPU Terminal Bases
Interface standards
The serial interfaces COM1 and COM2 are designed according to the standards EIA RS-232 and EIA
RS-485. Both interfaces can be operated either in RS-232 or in RS-485 mode.
Technical data
Standard of the serial interfaces
Interface connectors
Electrical isolation
Serial interface parameters
Operating modes
Supported protocols
COM1 can be configured and terminated for either RS-232 or RS-485 (depending on used terminals).
Please terminate according to the pin-out information for the COM1 port below and follow the
appropriate rules and practices for RS-232 and RS-485 communication.
Serial interface COM1 of the CPU Terminal Bases
Terminal block
removed
Figure: Serial interface COM1
____________________________________________________________________________________________________________
V2
AC500 Hardware
Supply voltage 24 V DC, 5-pole, terminals
L+
+24 V DC
L+
+24 V DC
M
0 V
M
0 V
FE
FE
1
Term. P
2
RxD/TxD-P
3
RxD/TxD-N
4
Term. N
5
RTS
6
TxD
7
SGND
8
RxD
9
CTS
COM1 9-pole, terminals
Terminal block inserted
EIA RS-232 or EIA RS-485
COM1: 9-pole removable terminal block
COM2: 9-pole Sub-D connector (female)
yes, against the CPU, 500 V DC
configurable by the software
programming or data exchange
Modbus or serial data exchange using special
software function blocks
UP
UP
ZP
ZP
Functional Earth
RS-485
Terminator P
RS-485
Receive/Transmit, positive
RS-485
Receive/Transmit, negative
RS-485
Terminator N
RS-232
Request To Send (output)
RS-232
Transmit Data (output)
Signal Ground
RS-232
Receive Data (input)
RS-232
Clear To Send (input)
1-33
System data
AC500 / Issued: 05.2007
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