Modbus Settings; Table 193: Modbus Settings - WAGO I/O SYSTEM 750 Manual

264 MODBUS – CODESYS 2
9.3.1

MODBUS Settings

The "MODBUS settings" group contains the following configuration parameters.

Table 193: MODBUS Settings

Parameters
PLC stop
behavior
Fieldbus error
response
*
Default setting
Explanation
Response of the MODBUS slave when the controller has halted
(controller in STOP state)
No data No data exchange possible. MODBUS requests
exchange will always be answered by the exception
response "ILLEGAL FUNCTION" (0x81).
Switch to Data exchange possible. Substitute values (0) are
substitute provided for MODBUS read requests and the
*
value values accepted unchanged in the local MODBUS
process image for write requests, without passing
these on to the controller.
Hold last Data exchange possible. The last frozen values
value 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.
Response of the MODBUS slave to detected fieldbus errors
(interruption of communication).
No data No data exchange possible.
exchange
Switch to Data exchange possible. Substitute values (0) are
substitute supplied from the MODBUS process image for
*
value 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 Data exchange possible. The previously frozen
value 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.
Version 1.1.0, valid from FW Version 02.06.20(09)
WAGO-I/O-SYSTEM 750
750-8208 PFC200 CS 2ETH RS CAN DPM
Manual