Omron NE1A-SCPU01 - 07-2009 Operation Manual page 223

Command Reference: Function Blocks
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Sequential Muting (Both Direction)
Block Diagram
1. Entrance
V V
Workpiece
L
2. Exit
MS11 MS12
MS11 MS12
D2
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
MS21: Muting sensor connected to Muting Signal 21
MS22: Muting sensor connected to Muting Signal 22
Muting Sequence
1. In the block diagram above, the light is not interrupted between MS11,
MS12, MS21, and MS22 and the light curtain, so the Output Enable signal
is ON.
2. For the entrance, as the workpiece moves to the right and MS11 and MS12
go ON in order (MS22 and MS21 go ON in order at the exit), muting is en-
abled, and the Muting Status goes ON.
3. As the workpiece continues advancing, the Output Enable signal is kept
ON even if the light curtain is obstructed.
4. As the workpiece continues advancing, the workpiece is no longer detect-
ed by MS21 at the entrance (MS12 at the exit), the muting status is
cleared, and the Muting Status goes OFF.
Light Curtain
MS11 MS12
MS11 MS12
d2
D3
Light Curtain
MS21 MS22
V V
MS21 MS22
d2
D3
Section 8-5
MS21 MS22
MS21 MS22
D2
Workpiece
L
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