Standard Functions
12.8 Watchdog (PLC/DCS monitoring)
SIMOCODE PRO V PN FDI
106 Programming and Operating Manual, 05/2020, A5E44499659002A/RS-AA/001
12.8 Watchdog (PLC/DCS monitoring)
Watchdog (PLC/DCS monitoring)
The Watchdog function block monitors communication with the PLC via PROFINET, as well
as the operating state of the PLC in the "Remote" operating mode.
Bus monitoring
With this type of monitoring, the "Trip - Bus" fault is generated if:
● "Bus Monitoring" is active.
● When, in the "Remote" operating mode (mode selector S1=1 and S2=1), the cyclic data
transfer between the PLC and SIMOCODE pro is interrupted, e.g. by the PROFINET
connection being interrupted.
● "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, "Trip - PLC/DCS" is generated if:
● "PLC/DCS Monitoring" is activated.
● The PROFINET switches to "CLEAR or 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 PROFINET is in the
"CLEAR" status, the "Status - PLC/DCS in Run" is set to "0".
If the "PLC/DCS Monitoring - Input" is connected primarily to the "Cyclic Receive - Bit 0.7"
bit, the status of the PLC is deduced from this bit only.
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