Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 228)

228 Rockwell Automation Publication 1752-UM001E-EN-P - June 2014
Appendix D 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.
1 0 0 1 0 1 0 0 1 0
1 0 1 0 0 1 0 1 0 1
1 0 1 1 0 1 0 1 1 0
1 1 0 0 0 1 1 0 0 0
1 1 0 1 0 1 1 0 1 0
1 1 1 0 0 1 1 1 0 0
1 1 1 1 1 1 1 1 1 0
Table 18 - Truth Table for Dual Channel (2 Pairs) Safety Gate Monitoring Function Block
Dual Channel Equivalent (2 Pairs) Dual Channel Complementary (2 Pairs)
Input 1
(NC)
Input 2
(NC)
Input 3
(NC)
Input 4
(NC)
Output
Enable
Input 1
(NC)
Input 2
(NC)
Input 3
(NC)
Input 4
(NC)
Output
Enable
Table 19 - 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.