Omron NE1A-SCPU01 - 07-2009 Operation Manual page 217

Command Reference: Function Blocks
Resetting Errors
Error
Output Enable
Discrepancy error OFF (safe state) ON
during AOPD input
Discrepancy error
during override
input
Synchronization ON (See note.)
error
Sequence error
Example Muting System Configurations
Note
Operation when error occurs
Fault Present
Discrepancy
Error (AOPD):
ON
Discrepancy
Error (Over-
ride): ON
ON (See note.) Synchronization
Error: ON
Sequence Error:
ON
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.
■
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
Workpiece
L L
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
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 output
• 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.
• 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.
• 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.
Light curtain
MS12
V V
MS11
D1= 1
d1
Section 8-5
Resetting
Reflected
Board
Reflected
Board
183