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EM, feedback circuit-
monitoring
359
02/16 MN05013001Z EN
The signal diagram of the function block for this application
shows:
• the dependence of the enable contact of EM01QS on the
state of coils EM01OC and EM01FL.
• the relationship between exceeded monitoring time
EM01DT and the error output EM01ER.
• the error acknowledgement with coil EM01RE.
• the re-enabling when the EM01RE reset coil picks up.
Figure 177:
Feedback example: signal diagram
a
Normal operation, emergency-stop not actuated
b
Emergency-stop actuated -> 0 signal at EM01OC -> EM01QS
switches off the device outputs -> Feedback loop not active
within the monitoring time (contactor stuck) -> EM01ER error
output active.
c
Fault in feedback loop rectified, emergency-stop released,
resulting in a 1 signal at EM01OC.
d
Actuating the Reset button clears the error status, the device
outputs are switched on and the feedback loop opens within
the monitoring time.
EM01OC
EM01FL
EM01QS
EM01ER
EM01RE
t > FT
t < FT
a
b
c
d
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