Siemens SIMATIC S7-400H - Failure and Replacement of a PROFIBUS-DP Slave

Failure and Replacement of Components During Operation
10-15
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
10.2.3 Failure and Replacement of a PROFIBUS-DP Slave
Initial situation
Failure How Does the System React?
The S7-400H is in redundant system mode
and one DP slave fails.
Both CPUs report the event in the
diagnostics buffer and via the appropriate
OB.
Procedure
To replace a DP slave, perform the following steps:
Step What Has To Be Done? How Does the System React?
1 Turn off the supply for the DP slave. -
2 Unplug the connected bus connector. -
3 Replace the DP slave. -
4 Plug the bus connector on and turn the
supply back on.
• CPUs process the mounting rack
failure OB 86 in synchronism
(outgoing event).
• DP slave can be addressed by the
relevant DP master system.