Allen-Bradley SmartGuard 600 User Manual

Publication 1752-UM001A-EN-P - October 2006
Function Blocks Command Reference 165
Light Curtain Function Block Parameters
Set these parameters for the LC function block.
Light Curtain Function Block Truth Tables
In the truth table, 0 is off and 1 is on.
Light Curtain 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.
LC Function Block Parameters
Parameter Valid Range Default Setting
Input Type Dual Channel Equivalent
Dual Channel Complementary
Dual Channel Equivalent
Discrepancy Time
0…30 s in 10 ms increments.
(1)
The discrepancy time must be equal to or
greater than the cycle time of the
controller.
(1) A discrepancy time check is not performed when the discrepancy time is set to 0.
30 ms
Truth Table for LC Function Block
Dual Channel Equivalent Dual Channel Complementary
Input 1 (NC) Input 2 (NC)
Output
Enable
Input 1 (NC) Input 2 (NC) Output
Enable
00
0000
01
0010
10
0101
11
1110

Allen-Bradley SmartGuard 600 Specifications

General

Brand	Allen-Bradley
Model	SmartGuard 600
Category	Controller
Language	English