User Manual

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 249
Function Blocks Command Reference Appendix D
Figure 70 - Time-difference Input Pattern 2: Exit Timing Chart
Example: Position Detection
In this example application, the workpiece is mounted on a machine turntable
surrounded by a guard fence. The operator can disable the light-interruption
signal of the light curtain safety function to set a workpiece on the turntable
when the machine’s dangerous area is on the opposite side of the operator.
Figure 71 - Application Setup
AOPD Input 1 (NC)
AOPD Input 2 (NC)
Muting Signal 11
Muting Signal 12
Output Enable
Muting
Muting Time
Synchronization Time
Muting Signal 21
Muting Signal 22
Machine’s Dangerous Area is on the Operator’s Side Machine’s Dangerous Area is on the Opposite Side
Work Platform
Limit Switch 1
(N.O. Contact)
Limit Switch 2
(N.C. Contact)
Light Curtain
Light Curtain
Operator
Controller
IN1 IN0
OFF
ON
Work Platform
Limit Switch 1
(N.O. Contact)
Limit Switch 2
(N.C. Contact)
Light Curtain Light Curtain
Operator
Controller
IN1 IN0
OFF
ON
Guard Fence
Guard Fence