Siemens SIMOCODE pro C System Manual page 269

Bus and controller monitoring on Modbus
With the SIMOCODE pro V Modbus basic unit, both the bus communication and the
controller function can be monitored. The functions "Bus monitoring" and
"PLC / PCS monitoring" are available for this purpose.
The functionality differs slightly from that described for SIMOCODE pro PROFIBUS.
● Bus monitoring: With this type of monitoring, the "Fault - bus" fault is generated if
– "Bus monitoring" is active
– In the "Remote" operating mode (mode selector S1 = 1 and S2 = 1), cyclic data
– The "Status - bus o. k." can always be evaluated. If SIMOCODE pro is cyclically
● PLC / PCS monitoring: With this type of monitoring, the "Fault - PLC/PCS" message is
generated if
– "PLC/PCS monitoring" is active
– The input "PLC/PCS monitoring - input" switches to logic zero when in the "Remote"
– The status "PLC/PCS in Run" can always be evaluated. If SIMOCODE pro is in cyclic
You can find the further description of the "Watchdog" function block (PLC/PCS monitoring)
in Chapter "Watchdog" (PLC/PCS monitoring) in the manual Parameterizing SIMOCODE pro
(https://support.industry.siemens.com/cs/ww/en/view/109743958).
SIMOCODE pro
System Manual, 05/2019, A5E40507475002A/RS-AD/004
access to Modbus registers between the PLC and SIMOCODE pro is interrupted for
longer than the set bus monitoring time, e.g. as the result of an interruption of the
Modbus connection.
exchanging data with the PLC, "Status - Bus o. k." is set to "1".
operating mode (mode selector S1=1 and S2=1). "PLC/PCS monitoring - input" is
connected preferably with the bit "Cyclic receive - bit 0.7".
data exchange with the PLC, and the input "PLC/PCS monitoring" is set, "PLC/PCS in
Run" is set to "1".
Commissioning, service, troubleshooting
13.2 Commissioning
269