Siemens SIMATIC S5 Manual page 212

Error-reporting If you selected "none" as the error-reporting mode in COM ET 200
mode "none" Windows, ET 200 responds as follows:
Caution
!
If you selected "none" as the error-reporting mode, you can only detect an
error in the distributed I/O in the application program by means of diagnostic
analysis with the IM308C.
Consequently, we strongly recommend that "none" be selected as the
error-reporting mode only for initial operation.
Table 11-7 Reaction to interruption of bus communication or failure of a DP slave (error-reporting mode "none")
Failed DP Reaction of CPU
slave(s): slave(s):
Response
monitoring
No CPU remains in
RUN
Yes CPU remains in
RUN
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Failed
DP slave
Reaction of failed DP slave(s):
Inputs in the CPU are set to "0",
outputs on the DP slave are ...
frozen.
set to "0" when response
monitoring time expires.
IM 308-C – starting ET 200
Remaining DP slaves
Reaction of remaining DP slaves:
The inputs in the CPU are
updated as before. The outputs
on the DP slaves are ...
updated as before.
updated as before.
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