Failure And Replacement Of A Redundant Profibus-Dp; Interface Module - Siemens SIMATIC S7-400H Manual

Failure and Replacement of Components During Operation
9.2.2

Failure and Replacement of a redundant PROFIBUS-DP

Interface Module

Initial situation
The S7-400H is in the Redundant system
mode and a PROFIBUS-DP interface
module (IM 153-2, IM 157) fails.
Replacement procedure
To replace PROFIBUS-DP interface module, perform the following steps:
Step
1 Turn off the supply for the affected DP
interface module.
2 Unplug the connected bus connector.
3 Insert the new DP Profibus interface
module and turn the supply back on.
4 Plug the bus connector back on.
9-14
Failure
What Has To Be Done?
S7-400H Programmable Controller Fault-Tolerant Systems
How Does the System React?
Both CPUs report the event in the
diagnostic buffer and via OB 70.
How Does the System React?
-
-
-
CPUs process the mounting rack
failure OB 70 in synchronism
(event having the state cleared).
Redundant access to the station is
again possible for the system.
A5E00068197-04