Watchdog (Bus Monitoring, Plc/Pcs Monitoring) - Siemens SIMOCODE pro Operating Manual

4.7.9

Watchdog (Bus monitoring, PLC/PCS monitoring)

Description
The "Watchdog" function block monitors communication with the PLC via communication
bus, as well as the operating state of the PLC in the "Remote" operating mode.
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 transfer
between the PLC and SIMOCODE pro is interrupted, e.g. by interruption of the bus
connection.
● "Status - Bus o.k." can always be evaluated. If SIMOCODE pro is cyclically exchanging
data with the PLC, "Status - Bus o.k." is set to "1".
PLC / PCS monitoring
With this type of monitoring, the "Fault - PLC/PCS" message is generated if
● "PLC / PCS monitoring" is active.
● For example, the PROFIBUS DP switches to the "CLEAR" status or the PROFINET
switches to the "Hold/Stop" status when in the "Remote" operating mode (mode selector
S1=1 and S2=1).
The "Status - PLC / PCS in Run" can always be evaluated. If the PROFIBUS DP is in the
"CLEAR" state, for example, "Status - PLC/PCS in Run" is set to "0".
If the "PLC/PCS monitoring - input" is connected primarily to the "Cyclic receive - bit 0.7" bit,
the status of the PLC is deduced from this bit only.
SIMOCODE pro - Parameterize
Operating Manual, 04/2017, A5E40507630002A/RS-AA/001
Parameters
4.7 Standard functions
227