288 Modbus – CODESYS 2
WAGO I/O SYSTEM 750 XTR
750-8202/040-001 PFC200 2ETH RS TELE XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
9.3.1
Modbus Settings
The “Modbus settings” group contains the following configuration parameters.
Table 212: Modbus Settings
Parameters Explanation
PLC stop
behavior
Response of the Modbus slave when the controller has halted
(controller in STOP state)
No data
exchange
No data exchange possible. Modbus requests will
always be answered by the exception response
“ILLEGAL FUNCTION” (0x81).
Switch to
substitute
value
*
Data exchange possible. Substitute values (0)
are provided for Modbus read requests and the
values accepted unchanged in the local Modbus
process image for write requests, without passing
these on to the controller.
Hold last value Data exchange possible. The last frozen values
are provided for Modbus read requests and the
values accepted unchanged in the Modbus
process image for write requests, without passing
these on to the controller.
Fieldbus error
response
Response of the Modbus slave to detected fieldbus errors
(interruption of communication).
No data
exchange
No data exchange possible.
Switch to
substitute
value
*
Data exchange possible. Substitute values (0)
are supplied from the Modbus process image for
PLC read functions; for write access the values
are accepted unchanged in the Modbus process
image without passing them on to the Modbus
master.
Hold last value Data exchange possible. The previously frozen
values are supplied from the Modbus process
image for PLC read functions; for write access
the values are accepted unchanged in the
Modbus process image without passing them on
to the Modbus master.
*
Default setting
