ABB AC500-S Safety User Manual page 371

Fig. 119: Timing diagram for SF_EnableSwitch: S_AutoReset = TRUE
The following conditions force a transition to the Error state:
Invalid static Reset signal in the process.
n
n Invalid switch positions.
Error Behavior
In the event of an error, the S_EnableSwitchOut safe output is set to FALSE and remains in this Safe state.
Different from other FBs, a Reset Error state can be left by the condition Reset = FALSE or, additionally,
when the signal S_SafetyActive is FALSE.
Once the error has been removed, the enable switch must be in the initial position specified in the process
before the S_EnableSwitchOut output can be set to TRUE using the enable switch. If S_AutoReset =
FALSE, a rising trigger is required at Reset.
30.03.2017
Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
AC500-S 371