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Command Reference: Function Blocks Section 8-5
Resetting Errors
Note If the AOPD input turns OFF (i.e., light curtain obstructed) while
there is a synchronization or sequence error, Output Enable will
turn OFF and Fault Present will turn ON.
Example Muting System Configurations
■ 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.
Block Diagram
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
Note The intersection of the two sensors must be after the light curtain.
Muting Sequence
1. In the block diagram above, the light is not interrupted between MS11 and
MS12 and the light curtain, so the Output Enable signal is ON.
2. As the workpiece moves to the right and MS11 and MS12 go ON in order,
muting is enabled.
3. As the workpiece continues advancing, the Output Enable signal is kept
ON even if the light curtain is obstructed.
Error Operation when error occurs Resetting
Output Enable Fault Present Error output
Discrepancy error
during AOPD input
OFF (safe state) ON Discrepancy
Error (AOPD):
ON
• Change the light curtain input pair (AOPD
inputs 1 and 2) from inactive to active.
• Change the NE1A-series Controller to IDLE
Mode and then return it to RUN Mode.
Discrepancy error
during override
input
Discrepancy
Error (Over-
ride): ON
• Change the override input pair (override
inputs 1 and 2) from inactive to active.
• Change the NE1A-series Controller to IDLE
Mode and then return it to RUN Mode.
Synchronization
error
ON (See note.) ON (See note.) Synchronization
Error: ON
• The error will be reset the next time a nor-
mal muting status is enabled.
• Change the NE1A-series Controller to IDLE
Mode and then return it to RUN Mode.
Sequence error Sequence Error:
ON
L
1
V
MS11
Reflected
Board
MS12
Reflected
Board
L
Light curtain
Workpiece
D1=
d1
V
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