Edm - Pilz PSEN sc M 3 Series Operating Manual

Function description
Fig.: Timing diagram reset
4.7

EDM

Contactors outside the safety laser scanner can be monitored (External Device Monitoring
= EDM, also known as feedback loop monitoring).
EDM only needs to be activated if the contactors are controlled directly.
A test is performed to see that the N/C contacts switch if the state of the OSSDs changes
and so is used to monitor and detect malfunctions on the contactors. If a malfunction is de-
tected, the safety laser scanner switches to a safe condition and stops the connected ma-
chine. This check is carried out each time the OSSDs are triggered and before restarting.
The EDM function is available:
}
Only when using the 12-pin connection
} Only for the OSSD pairs 1 and 2.
Operating Manual PSEN sc M 3/5 series
1005055-EN-02
OSSD
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