Siemens SIMATIC S7-400H - Failure and Replacement of a Communication Processor

Failure and Replacement of Components During Operation
10-7
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
10.1.4 Failure and Replacement of a Communication Processor
This section describes the failure and replacement of communication processors
for the PROFIBUS and Industrial Ethernets.
The failure and replacement of communication processors for the PROFIBUS-DP
are described in Section 10.2.1
Initial situation
Failure How Does the System React?
The S7-400H is in redundant system mode
and one communication processor fails.
• Both CPUs report the event in the
diagnostics buffer and via appropriate
OBs.
• With communications via standard
connections
Connection failed
• With communications via redundant
connections
Communications are maintained without
interruption over an alternative channel.
Procedure
To replace a communication processor for a PROFIBUS or an industrial Ethernet,
perform the following steps:
Step What Has To Be Done? How Does the System React?
1 Extract the module. Both CPUs process the
insert/remove-module interrupt OB 83
in synchronism.
2 Make sure that the new module has no
parameter data in its integrated
FLASH EPROM and plug it in.
• Both CPUs process the
insert/remove-module interrupt
OB 83 in synchronism.
• The module is automatically
configured by the appropriate
CPU.
3 Turn the module back on. The module resumes communications
(system establishes communication
connection automatically).