Failure Response Of The S5-95U - Siemens SIMATIC S5 Manual

S5-95U – starting ET 200

12.5 Failure response of the S5-95U

Monitoring
mechanism
Monitoring time
for control
processor
Monitoring time
characteristics
12-12
The S5-95U has an integral failure-monitoring system which notifies the
communication processor of:
cycle monitoring time overshoot
control processor failure
When the DP master interface runs up, the communication processor in the
S5-95U starts a monitoring time of 0.5 s.
When this monitoring time times out, the communication processor
recognizes a failure of the control processor. The S5-95U goes to STOP.
The monitoring time is cleared when the S5-95U goes from RUN to STOP.
The monitoring time is started when the S5-95U goes from STOP to RUN.
The monitoring time is retriggered at the cycle checkpoint of the S5-95U and
when the OB 31 is called.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a