Standards Requirements
EN 954-1: 1996 5.4 Manual reset
ISO 12100-2:
2003
4.11.4: Restart following power failure/spontaneous restart
This FB controls an entrance to a hazardous area via an interlocking guard with guard locking (“four state
interlocking”).
The function controls the guard lock and monitors the position of the guard and the lock. This function block
can be used with a mechanical locked switch.
The operator requests to get access to the hazardous area. The guard can only be unlocked when the haz-
ardous area is in a safe state. The guard can be locked if the guard is closed. The machine can be started
when the guard is closed and the guard is locked. An open guard or unlocked guard will be detected in the
event of a safety-critical situation.
The S_StartReset and S_AutoReset inputs shall only be activated if it is ensured that no hazardous situation
can occur when the PES is started.
Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
30.03.2017 AC500-S 317
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