ABB AC500-S Safety User Manual page 220

Configuration and programming
AC500-S libraries > SafetyBlocks_PLCopen_AC500_v22.lib
When opening the safety guard, both S_GuardSwitch1 and S_GuardSwitch2 inputs should
switch to FALSE. The S_GuardMonitoring output switches to FALSE as soon as one of the
switches is set to FALSE. When closing the safety guard, both S_GuardSwitch1 and S_Guard-
Switch2 inputs should switch to TRUE.
This FB monitors the symmetry of the switching behavior of both switches. The S_GuardMoni-
toring output remains FALSE if only one of the contacts has completed an open/close process.
The behavior of the S_GuardMonitoring output depends on the time difference between the
switching inputs. The discrepancy time is monitored as soon as the value of both S_Guard-
Switch1/S_GuardSwitch2 inputs differs. If the DiscrepancyTime has elapsed, but the inputs still
differ, the S_GuardMonitoring output remains FALSE. If the second corresponding S_Guard-
Switch1/S_GuardSwitch2 input switches to TRUE within the value specified for the Discrepan-
cyTime input, the S_GuardMonitoring output is set to TRUE following acknowledgment.
The S_StartReset and S_AutoReset inputs shall only be activated if it is ensured that no haz-
ardous situation can occur when the PES is started.
Table 36: FB name: SF_GuardMonitoring
Name Data type
VAR_INPUT
Activate BOOL
S_GuardSwitch1 BOOL
S_GuardSwitch2 BOOL
DiscrepancyTime TIME
S_StartReset BOOL
S_AutoReset BOOL
Reset BOOL
VAR_OUTPUT
Ready BOOL
S_GuardMonitoring BOOL
Error BOOL
DiagCode WORD
220
Initial value Description, parameter values
FALSE Ä Table 16 "General input parameters" on page 192
FALSE Variable.
Guard switch 1 input.
FALSE: Guard is open.
TRUE: Guard is closed.
FALSE Variable.
Guard switch 2 input.
FALSE: Guard is open.
TRUE: Guard is closed.
T#0ms Constant.
Configures the monitored synchronous time between
S_GuardSwitch1 and S_GuardSwitch2.
Ä Table 16 "General input parameters" on page 192
FALSE
- only constant
FALSE Ä Table 16 "General input parameters" on page 192
- only constant
FALSE Ä Table 16 "General input parameters" on page 192
Ä Table 17 "General output parameters"
FALSE
on page 193
FALSE Output indicating the status of the guard.
FALSE: Guard is not active.
TRUE: both S_GuardSwitches are TRUE, no error
and acknowledgment. Guard is active.
Ä Table 17 "General output parameters"
FALSE
on page 193
Ä Table 17 "General output parameters"
16#0000
on page 193
3ADR025091M0208, 12, en_US 2020/06/19