Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 242)

242 Rockwell Automation Publication 1752-UM001E-EN-P - June 2014
Appendix D Function Blocks Command Reference
Figure 62 - Application Setup
Sensor 12 is connected to Muting Signal 12. Sensor 11 is connected to Muting
Signal 11.
Muting Sequence
In this example, the muting sequence is described below.
1. The light is not interrupted between sensors 11 and 12 and the light
curtain, so the Output Enable signal is on.
2. As the workpiece moves to the right and sensors 11 and 12 go on in order,
muting is enabled.
3. As the workpiece continues to advance, the Output Enable signal is kept
on even if the light curtain is obstructed.
4. As the workpiece continues to advance, the light from sensor 11 is no
longer interrupted by the workpiece, the muting status is cleared, and the
muting signal turns off.
Distance Settings
When setting up this type of muting application, the distance settings must
prevent a passing person from enabling the muting function, and the light curtain
and muting sensors must be set up so that a workpiece passes by all of the muting
sensors before the next workpiece arrives at the muting sensors.
To calculate the appropriate setup distances for this example use these formulas,
where:
D1 = minimum distance required for muting sensor performance
d1 = maximum distance required for muting sensor performance
L = length of the workpiece
V = transit speed of the workpiece
T1min = controller cycle time
T1max= synchronization time setting (the default setting is 3 seconds)
Formula 1: D1 < L
Formula 2: V x T1min < d1 < V x T1max
Sensor 12 Reflected
Board
Reflected
Board
Sensor 11
Workpiece
Light Curtain
L
V
D1 = d1