Removing Components In Step 7 - Siemens SIMATIC S7-400H System Manual

14.6

Removing components in STEP 7

Starting situation
You have verified that the CPU parameters, such as monitoring times, match the planned
new program. If they do not, adapt the CPU parameters first (see section Editing CPU
parameters (Page 234)).
The modules to be removed and their connected sensors and actuators are no longer of any
significance to the process being controlled. The fault-tolerant system is operating in
redundant mode.
Procedure
Carry out the steps listed below to remove hardware components from a fault-tolerant
system in STEP 7. Details of each step are listed in a subsection.
Step
I
II
III
IV
V
VI
VII
VIII
Exceptions
This general procedure for system modifications does not apply to removing interface
modules (see section Removing interface modules in STEP 7 (Page 233)).
Note
After changing the hardware configuration, it is downloaded practically automatically. This
means that you no longer need to perform the steps described in sections STEP 7, step III:
Stopping the standby CPU (Page 229) to STEP 7, step VI: Transition to redundant state
(Page 231). The system behavior remains unchanged as already described.
You will find more information in the HW Config online help, "Download to module ->
Download station configuration in RUN mode".
S7-400H
System Manual, 09/2007, A5E00267695-03
What has to be done?
Offline modification of the hardware configuration
Editing and downloading the user program
Stopping the standby CPU
Loading new hardware configuration in the standby CPU STEP 7, step IV: Loading new
Switch to CPU with altered configuration
Change to redundant mode
Modification of hardware
Editing and downloading organization blocks
System modifications in operation
14.6 Removing components in STEP 7
See section
STEP 7, step I: Offline
modification of the hardware
configuration (Page 228)
STEP 7, step II: Editing and
downloading the user program
(Page 228)
STEP 7, step III: Stopping the
standby CPU (Page 229)
hardware configuration in the
standby CPU (Page 229)
STEP 7, step V: Switch to CPU
with modified configuration
(Page 230)
STEP 7, step VI: Transition to
redundant state (Page 231)
STEP 7, step VII: Modification of
hardware (Page 232)
STEP 7, step VIII: Editing and
downloading organization blocks
(Page 232)
227