Omron NE1A-SCPU01 - 2006 Operation Manual page 192

Command Reference: Function Blocks
Muting Function
Muting Start and Stop Conditions
Note
Example Muting System Configurations
is executed, the Output Enable signal will turn ON and the Fault Present
signal will turn OFF.
Reset Conditions
The Output Enable is ON when all of the following conditions are met.
• The light curtain signal is active (light incident).
• A Discrepancy Error has not occurred.
Start Conditions
If the Muting signals meet the following conditions while the Output Enable
signal is ON, muting will be applied and the Muting Status will be turned ON.
1. The muting sensors are all OFF.
2. While the muting sensors are all OFF, two Muting signals are detected in
the correct sequence.
3. While the muting sensors are all OFF, the synchronization times of the two
Muting signals are within the normal range (not including the position de-
tection setting).
If one of the errors listed above occurs, the following alarm outputs will be
generated.
• The Sequence Error signal will go ON if there is an invalid sequence, as
described above.
• The Synchronization Error signal will go ON if an object cannot be
detected within the synchronization time, as described above.
Also, the safety output will go OFF if the light curtain signal is inactive (no
light) before the Controller goes into the muting state.
Stop Conditions
If the following conditions are met while muting is in effect, the muting will be
stopped and the Muting Status will go OFF.
• Two or more Muting signals are not ON.
• The Max. Muting Time has elapsed.
• A discrepancy error has occurred.
Also, the Output Enable signal will go OFF if muting is stopped and the light
curtain is obstructed.
When the operating mode of the NE1A-series Controller is changed from Idle
to Run Mode, the input data from the Slaves will be OFF until communications
are established.
If Slave input data is used for the AOPD Input, the Fault Present and
Sequence Error Outputs will turn ON just after the operating mode is changed
to Run Mode. When the AOPD Input turns ON, the Fault Present Output will
turn OFF. When the muting start condition is met, the Sequence Error Output
will turn OFF.
Parallel Muting with 2 Sensors
In this example, two Retro-reflective Photoelectric Sensors are set up as the
muting sensors with intersecting detection zones.
Use this configuration when the workpiece length (L) is not fixed or not long
enough.
Section 6-5
157