7.4 EDM
The External Device Monitoring (EDM) function controls external devices by verifying the OSSDs status.
EDM enabled:
When EDM is enabled in PNP configuration it’s necessary to connect EDM input (pin 6 of M12-12 poles - RX) to a
24 VDC normally-closed contact of the device to be monitored.
The figure below shows how to connect the EDM input.
Fig 48 - PNP configuration
The function controls the 24VDC normally-closed contact switching according to the changes of the OSSDs’ status.
Fig 49 - EDM timings (PNP configuration)
The EDM status is antivalent with OSSDs’: the timing diagram explains the relationship between the cause
(OSSDs) and the effect (EDM) with the maximum permissible delay.
Tc <= 350 msec (time between OSSD OFF-ON transition and EDM test)
To >= 100 msec (time between OSSD ON-OFF transition and EDM test)
(two different times for the mechanical contact driven by a spring)
In normal operation the third led switched on in the user interface indicates that this
function is active.
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