SF4C Safety light curtain
3.7 External Device Monitor Function
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3.7 External Device Monitor Function
This is the function for checking whether the external safety relay connected to the control
output (OSSD 1, OSSD 2) performs normally in accordance with the control output (OSSD 1,
OSSD 2) or not. If any abnormality such as a deposit on the contacting point, etc. is detected,
the status of the sensor changes to lockout and the control output (OSSD 1, OSSD 2) is turned
to OFF.
•
When the external device monitor function is activated:
Connect the external device monitor input to the external safety relay of the control
output (OSSD 1, OSSD 2).
•
When the external device monitor function is deactivated:
Connect the external device monitor input to the auxiliary output. By default, the
auxiliary output is set to negative logic of the control output (OSSD 1, OSSD 2). The
setting can be changed with the handy controller. In this case, the auxiliary output
cannot be connected to external devices.
NOTE
You can deactivate the external device monitor function or change the time
range with the handy controller.
Reception status
Control output
(OSSD 1, OSSD 2)
External device
monitor input
Beam
received
Beam
blocked
ON
OFF
ON
OFF
90ms or less
7ms or less
300ms or less
300ms or less
Time diagram - normal operation
The setting time of the device monitor is 300ms or less. Exceeding 300ms turns the device into
the lockout status.
300ms
Reception status
Control output
(OSSD 1, OSSD 2)
External device
monitor input
Beam
received
Beam
blocked
ON
OFF
ON
OFF
7ms or less
Lockout status
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