Replacement Of A Profibus Dp Master - Siemens SIMATIC CPU 410 System Manual

Replacement of failed components during redundant operation
13.3 Replacement of components of the distributed I/O on PROFIBUS DP
Replacement of signal and function modules
Note the different procedures.
Minor injury or damage to equipment is possible.
The procedure for replacing and input/output or function module differs for modules of the
S7-300 and S7-400.
Use the correct procedure when replacing a module. The correct procedure is described
below for the S7-400 in Chapter Replacement of an input/output module or function module
(Page 226).
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.
13.3.1

Replacement of a PROFIBUS DP master

Starting situation
Failure
The S7-400H is in the redundant system state
and a DP master module fails.
234
CAUTION
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 over the DP master
of the partner.
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC