Allen-Bradley SmartGuard 600 User Manual

Publication 1752-UM001A-EN-P - October 2006
174 Function Blocks Command Reference
Two-hand Control 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.
Use this table to diagnose and reset a Discrepancy Error condition in
the Two-hand Control function block.
Two-hand Control Function Block Timing Chart
Error Detection and Reset for Two-hand Control Function Block
Error
Condition
Status When an Error Occurs To Reset the Error Condition
Output
Enable
(1)
(1) The Output Enable signal will not turn ON if the synchronization time requirement is not met (that is, operation
inputs for both hands must be completed within 500 ms), but this is not considered an error.
Fault
Present
Error
Output
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 both input pairs 1 and 2
inactive and active again.
2. Change the controller’s
operating mode to Idle and
back to Run.
Discrepancy
Error at Pair
2
Discrepancy
Error Pair 2:
ON
Input 1
(pair 1 - NO)
Fault Present
Idle to
RUN
Output
Enable
Discrepancy Error
Pair 1
500 ms Discrepancy Time
Input 2
(pair 1 - NC)
Input 3
(pair 2 - NO)
Input 4
(pair 2 - NC)
500 ms 500 ms
Discrepancy Error
Pair 2

Allen-Bradley SmartGuard 600 Specifications

General

Brand	Allen-Bradley
Model	SmartGuard 600
Category	Controller
Language	English