Operating Instructions Chapter 5
C4000 Micro/Basic/Basic Plus/Eco
8009423/YT79/2016-03-14 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 33
Subject to change without notice
Electrical installation
5.4 External device monitoring (EDM)
The EDM checks if the contactors actually de-energise when the protective device
responds. If, after an attempted reset, the EDM does not detect a response from the
switched device within 300 ms, the EDM will deactivate the OSSD switching outputs again.
You must implement the external device monitoring electrically by the positive closing
action of both N/C contacts (k1, k2) when the contact elements (K1, K2) reach their de-
energised position after the protective device has responded. 24 V is then applied at the
input of the EDM. If 24 V is not present after the response of the protective device, then
one of the contact elements is faulty and the external device monitoring prevents the
machine starting up again.
• If the contact elements to be monitored are connected to the external device monitoring
(EDM) input, then the safety light curtain activates external device monitoring during the
next start-up and saves this configuration in the device.
• You can again deactivate the external device monitoring at a later time by using the
start-up configuration (see section 7.4 “Start-up configuration” on page 40). In this
case, pin 6 (C4000 Basic) and pin 4 (C4000 Micro/Basic Plus), respectively, must not
be connected to 24 V.
contact elements to the EDM
Notes
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