Siemens SIMATIC ET 200M Operating Instructions Manual page 110

Maintenance and service
7.4 Replacing the IM 153-2 or IM 153-2 FO
In the case of redundancy
Note
If the active IM 153 -2 / -2 FO ("ACT"-LED on) is to be replaced, the I/O modules then
continue to run uninterrupted if
• on the passive IM 153 -2 / -2 FO neither the BF LED is lit or is flashing nor the SF LED
• with a flying redundancy system, from which it is evident from the master diagnosis that
Have you replaced an active IM 153 -2 / -2 FO
("ACT"-LED on)?
The in the ET 200M the other IM 153-2 / -2 FO is
switched to and this also maintains the data
traffic to its DP master.
Does the new IM 153 -2 / -2 FO have a different version to that of the one that has not been
replaced?
If, after replacement, the IM 153 -2 / -2 FO that has just been replaced goes to "STOP" (all LEDs
flashing), then the versions are not compatible. In this case, you must switch off the ET 200M and
update both IM 153-2 / -2 FO or use a compatible version.
Contact your Siemens representative.
See also
Diagnostics with LED display (Page 185)
108
flashes at 0.5 Hz.
both IM are available (in this case the BF LED can flash).
Have you replaced a passive IM 153 -2 / -2 FO
("ACT"-LED off)?
No change in data traffic: the active IM 153 -2 / -2
FO maintains the data traffic to its DP master.
Operating Instructions, 12/2008, EWA-4NEB780600602-08
ET 200M