Publication 1752-UM001A-EN-P - October 2006
188 Function Blocks Command Reference
Muting Sequence
The muting sequence for this example is described below.
• The light is not interrupted between sensors 11, 12, 21, and 22
and the light curtain, so the Output Enable signal is on.
• As the workpiece moves to the right and sensors 11 and 12 go
on in order, muting is enabled and the muting signal turns on.
• As the workpiece continues to advance, the Output Enable
signal is kept on even if the light curtain is obstructed.
• As the workpiece continues to advance, the light from sensor 21
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:
D2 and D3 = minimum distance required for muting sensor
performance
d2 = 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 3: D2 < L
Formula 4: D3 < L
Formula 5: V x T1min < d2 < V x T1max
For the muting function to operate effectively, formulas 3, 4, and 5
must be satisfied.
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