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Safety Device Function Blocks Section 3-5
Supported Muting
Applications
Any of the following four muting modes can be selected to enable typical mut-
ing applications.
Muting Starting, Ending,
and Stopping Conditions
Starting Conditions
Muting status will turn ON if the following muting detection conditions are all
satisfied. (For position detection, conditions 4 and 5 are not required. Muting
status will be started when the muting sensor turns ON.)
1. The AOPD signal must be active (light to the light curtain must not be ob-
structed).
2. There must be no discrepancy errors, synchronization errors, or sequence
errors.
3. All the muting sensors must be OFF.
4. The two muting sensors in condition 3 must detect in the normal sequence.
5. The synchronization time of the two muting sensors in condition 3 must be
within the normal range.
If an error occurs in the above conditions, the following alarms will be output.
• A sequence error will be output if the two muting sensors are not detected
in the normal sequence.
• A synchronization error will be output if the synchronization time of the
two muting sensors is not detected in the normal range.
Also, Output Enable will turn OFF if the AOPD signal becomes inactive (light
obstructed) before the muting status is achieved.
Stopping Conditions (Ending Conditions)
Muting will be stopped and muting status will turn OFF if any of the following
conditions occur:
1. The system enters any of the following status from muting status.
Muting Mode Application
Parallel Muting with 2
Sensors
This mode is suitable for applications at a conveyor entrance.
Use this mode when two Retro-reflective Photoelectric Sensors are set
up as the muting sensors with intersecting detection zones.
Sequential Muting in
Forward Direction
This mode is suitable for applications at a conveyor entrance.
Use this mode when four Through-beam Photoelectric Sensors are set
up as the muting sensors.
Sequential Muting in
Both Directions
This mode is suitable for applications at a conveyor entrance or exit.
Use this mode when four Through-beam Photoelectric Sensors are set
up as the muting sensors.
Position Detection This mode is suitable for applications in which the operator sets the
workpiece and then the workpiece is moved to the processing area by a
turn table or workpiece conveyor robot. Muting is enabled by detecting
that the robot is in a safe location using a limit switch or other device.
Use this mode to temporarily disable the light curtain when the operator
sets the workpiece at the conveyor entrance.
Muting Mode Ending condition
Parallel Muting with 2 Sensors Muting signal 11 or 12 turns OFF.
Sequential Muting in Forward Direc-
tion
Muting signals 11, 12, and 21 turn OFF.
Sequential Muting in Both Directions Input Sequence
Muting signals 11, 12, and 21 turn OFF.
Output Sequence
Muting signals 12, 21, and 22 turn OFF.
Position Detection Muting signal 11 turns OFF.
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