Omron NE1A-SCPU01 - 2006 Operation Manual page 202

Command Reference: Function Blocks
Override Function
The Override function can turn ON the safety output ON even though the light-
interruption signal of the light curtain is inactive. If a workpiece gets jammed
during transit as shown in the following diagram, the system cannot be
returned to normal operation without forcibly removing the workpiece. In a sit-
uation like this, the Override function can be used to move the workpiece out
of the light curtain detection zone.
MS11
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
Override Sequence
1. In the block diagram above, the Output Enable signal is OFF.
2. When the Override Input goes ON, the Override function starts and the
Override Status goes ON. As long as the Override inputs are ON, the mut-
ing status is
forcibly enabled, and both the Muting Status and Output Enable signals are
ON.
3. When the workpiece moves to the right until it is no longer detected by the
MS12, the muting status forced by the Override function will be cleared,
and both the Muting Status and Override Status will go OFF.
Override Start and Stop Conditions
Start Conditions
If the following conditions are met, the Override function will start and the Out-
put Enable, Muting Status, and Override Status will all go ON.
1. At least one Muting Signal is ON.
2. The light curtain is inactive (obstructed).
3. The Output Enable is OFF.
4. The Override Input is ON (when set as a Single input) or Active (when set
as Dual inputs).
Light curtain
MS12
WORK
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