Allen-Bradley SmartGuard 600 User Manual

Publication 1752-UM001A-EN-P - October 2006
Function Blocks Command Reference 163
ESTOP Function Block Error Handling
A discrepancy error is generated when one of the inputs is not in it’s
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 ESTOP function block.
Truth Table for ESTOP Function Block
Single Channel Dual Channel Equivalent Dual Channel Complementary
Input 1
(NC)
Output
Enable
Input 1
(NC)
Input 2
(NC)
Output
Enable
Input 1
(NC)
Input 2
(NO)
Output
Enable
0
00000 0 0
1
10100 1 0
-- -- 1 0
01 0 1
-- -- 1 1
11 1 0
Error Detection and Reset for ESTOP Function Block
Error
Condition
Status When an Error Occurs To Reset the Error Condition
Output Enable Fault
Present
Error
Output
Discrepancy
Error
OFF
(Safety State)
ON Discrepancy
Error
Output: ON
Remove the cause of the error
and then either:
1. Make the inputs active and
inactive again.
2. Change the controller’s
operating mode to Idle and
back to Run.

Allen-Bradley SmartGuard 600 Specifications

General

Brand	Allen-Bradley
Model	SmartGuard 600
Category	Controller
Language	English