Publication 1752-UM001A-EN-P - October 2006
170 Function Blocks Command Reference
Safety Gate Monitoring Function Block Error Handling
A discrepancy error is generated when one of the inputs is not in its
correct state for longer than the discrepancy time. For example, in
Dual Channel Equivalent mode, both inputs must be active (on)
within the discrepancy time or an error occurs.
If two pairs of inputs are selected and a synchronization time is
entered, both pairs of inputs must be in the same state within the
synchronization time or a synchronization error occurs. The
discrepancy time applies to both inputs of the same input pair being
in the same state within a given time, whereas the synchronization
time applies to both sets of input pairs being in the same state within
a given time.
Use this table to diagnose and reset a discrepancy error condition in
the Safety Gate Monitoring function block.
Error Detection and Reset for Safety Gate Monitoring Function Block
Error
Condition
Status When an Error Occurs To Reset the Error Condition
Output
Enable
Fault
Present
Error Output When Function Test is Disabled When Function Test is Enabled
Discrepancy
Error at Pair 1
OFF
(Safety State)
ON Discrepancy
Error Pair 1: ON
Remove the cause of the error and
then either
1. Make the inputs active and
inactive again.
(2)
2. Change the controller’s
operating mode to IDLE and
back to RUN.
Remove the cause of the error and
then make the inputs active and
inactive again (that is, perform the
safety gate test).
Discrepancy at
Pair 2
Discrepancy
Error Pair 2: ON
Function Test
Error
(1)
Function Test
Error: ON
Synchronization
Error
Synchronization
Test Error: ON
(1) Safety gate test was not performed normally between Function Test signals.
(2) If a Discrepancy Error occurs in one of the pairs when set to Dual Channel Equivalent (2 Pairs) or Dual Channel Complementary (2 Pairs), make input pairs 1 and 2 both
inactive and then active.
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