Failure And Replacement Of A Profibus Dp Master - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

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
4
5
Exchanging a CP 443-5 in case of spare part requirement
If a CP 443-5 is replaced by a successor module with a new article number, both modules
must always be replaced in the case of redundantly used components.
Redundantly used modules must be identical, which means they must have the same article
number, product version and firmware version.
Follow the steps below:
Step What to do?
1 Stop the standby CPU
2 Turn off the power supply of the central rack.
3 Unplug the Profibus DP cable of the affected DP
master module.
4 Replace the module.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
Failure and replacement of components during redundant operation
11.2 Failure and replacement of components of the distributed I/Os
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.
Plug the Profibus DP back in.
Turn on the power supply of the central
rack.
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.
–
–
–
The CPU performs an automatic LINK-
•
UP and UPDATE.
The CPU changes to RUN and operates
•
as the reserve CPU.
How does the system react?
The fault-tolerant system switches to single mode,
see chapter Step 3: Stop the standby CPU
(Page 159)
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–
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