5. Safety-related function
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i. -|Transparent setting guide|-
5.4 Muting
In the muting condition, the OSSD output maintains ON state regardless of the object in the muting zone.
The factory default of muting zone is set to entire detection zone.
The part of muting zone can be set via atLightCurtain.
Muting begins when the signals are correctly applied to the two mute inputs on the emitter,
and ends by an end condition.
Muting suspends the safety-related functions temporarily so that it should be used in an environment where the detection
objects, such as workpieces, frequently pass through the detection zone (e.g., conveyor systems).
When using a combination of muting and blanking functions, the muting and blanking zones can be overlapped.
- Fixed blanking: Fixed blanking is prioritized because it is unavailable to distinguish between the fixed object
and the detection object
- Floating blanking: Muting is prioritized because it is unavailable to distinguish between the moving object
and the detection object.
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If you need to show that the muting function is activated, install the indicator (e.g., warning lamp) where it can be
checked at all sites.
Muting sensor is a device to control the start and end of the muting function.
The muting sensors are connected to the mute1 input and mute 2 input, providing the outputs.
The specifications of the muting sensor as follows:
i. Use sensors that have the same output type (NPN or PNP)
ii. Use sensors that have 3-wire or N.O. contacts
In case of the SFLA (advanced type of light curtain), use atLightCurtain to select N.O. or N.C. contact
based on the output type of muting sensor.
iii. Use sensors that output is ON when detecting an object, and operate in Dark ON mode
When you use the photoelectric sensor as a muting sensor, light interference may occur and it may cause
malfunction of the muting.
When an error occurs, see the following measures
•
Use a sensor with mutual interference prevention
•
Adjust the sensor position and beams to avoid interference
•
Install a light shield plate, an anti-interference filter, or a slit
•
Lower the sensitivity of the sensor
For more information on error and warnings, see
For more information on the external indicators, see
5.4.1 Standard mode
The standard mode is the factory default of muting. Muting starts by signals from the correct mute input sequence which you
set. The initial setting of mute input sequence is 1 → 2 and it can be changed via atLightCurtain.
•
Muting start condition (All conditions are required.)
i. Not lockout condition
ii. There is no object in the detection zone and the OSSD output is in ON state.
(If you use the muting function with the blanking function, keep the blanking zone blocked.)
iii. Mute 1 and mute 2 inputs are applied within the range of mute input time limit (T1min - T1max)
based on the sequence you set.
iv. The monitoring result of lamp output is normal.
(The output mode of lamp output should be set to Muting/Override.)Muting end condition (One or more conditions are
required.)
Be sure to install the muting devices where the qualified personnel only can handle and change.
Make sure that the installation position can be changed under the supervision of the responsible person for use.
