Siemens SIMATIC S7-400H - Removing Components in STEP 7

Modifying the System During Operation
11-32
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
11.5 Removing Components in STEP 7
Initial situation
You have ensured that the CPU parameters (e.g. the monitoring times) suit the
planned new program. If necessary you must first change the CPU parameters
accordingly (see Section 11.6).
The modules to be removed and the associated sensors and actuators are no
longer of any significance for the process to be controlled. The fault-tolerant
system is working in redundant system mode.
Procedure
In order to remove hardware components from a fault-tolerant system under
STEP 7 the steps listed below are to be performed. Details of each step are listed
in a subsection.
Step What Has To Be Done? Refer to Section
I Offline Modification of the Hardware Configuration 11.5.1
II Changing and Loading User Program 11.5.2
III Stopping the Standby CPU 11.5.3
IV Loading New Hardware Configuration in the Standby CPU 11.5.4
V Switch to CPU with modified configuration 11.5.5
VI Transition to Redundant System Mode 11.5.6
VII Modification of Hardware 11.5.7
VIII Modifying and Loading Organization Blocks 11.5.8
Exceptions
This procedure for system modification should not be used to remove interface
modules (see Section 11.5.9).