Failure And Replacement Of A Profibus Dp Master - Siemens SIMATIC PCS 7 System Manual

Failure and replacement of components during redundant operation
11.2 Failure and replacement of components of the distributed I/Os
To replace signal and function modules of an S7-300, perform the following steps:
Step What to do?
1 Disconnect the module from its load current supply.
2 Remove the failed module (in RUN mode).
3 Disconnect the front connector and wiring.
4 Plug the front connector into the new module.
5 Insert the new module.
11.2.1

Failure and replacement of a PROFIBUS DP master

Starting situation
Failure
The S7-400H is in redundant system mode and a
DP master module fails.
Procedure
Proceed as follows to replace a PROFIBUS DP master:
Step
1
2
3
182
What to do?
Turn off the power supply of the central
rack.
Unplug the Profibus DP cable of the affect-
ed DP master module.
Replace the module.
How does the system react?
Both CPUs generate a remove/insert
•
interrupt and enter the event in the diagnostic
buffer and the system status list.
-
-
Both CPUs generate a remove/insert
•
interrupt and enter the event in the diagnostic
buffer and the system status list.
Parameters are assigned automatically to the
•
module by the CPU concerned and the module is
addressed again.
How does the system react?
With single-channel one-sided I/O:
•
The DP master can no longer process con-
nected DP slaves.
With switched I/O:
•
DP slaves are addressed via the DP master
of the partner.
How does the system react?
The fault-tolerant system switches to single
mode.
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CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB