Programming manual SCU-series
HB-37500-820-10-12F-EN SCU Programming manual
Page 179 of 252
Status: 19.03.2021
EDM (External Device Monitoring)
monitoring of external switch contacts
Number:
c. f.
“Overview of safety modules”
Function:
Normally, additional switch devices are necessary for contact multiplication
and for power multiplication. These switching devices are triggered via the
outputs of the safety block. The EDM monitoring device implements the
“Safety relay” function by proces
sing an external feedback circle. For
applications according to category 4 of EN 954-1, for these switch devices,
among others, functional monitoring is required. For functional monitoring,
the switching devices must be equipped with positivey driven auxiliary
contacts.
Input:
activation signal external switch contact
Reset of external switch contact
RESET function:
Up to 6 resets are configurable.
Description of the function:
•
Test of external Feedback signal for state of external switch contact.
•
State of Feedback signal must change within response time / release time.
•
A faulty error signal or a status change larger than the response time / the release time is
signalled at the
“Error” output as “high”.
t
Enable
Feedback
Response
time
Release
time