System modifications during operation
17.6 Removing components in STEP 7
S7-400H
System Manual, 03/2012, A5E00267695-11
321
17.6.9 Removing interface modules in STEP 7
Always switch off the power before you remove the IM460 and IM461 interface modules,
external CP 443-5 Extended DP master interface module, and their connecting cables.
Always switch off power to an entire subsystem. To ensure that this does not influence the
process, always set the subsystem to STOP before you do so.
Procedure
1. Change the hardware configuration offline (see section STEP 7, step 1: Editing the
hardware configuration offline (Page 314))
2. Modify and download the
user program (see section STEP 7, step 2: Editing and
downloading the user
program (Page 315))
3. Stop the reserve CPU (se
e section STEP 7, step 3: Stopping the reserve CPU
(Page 315))
4. Download the
new hardware configuration to the reserve CPU (see section STEP 7, step
4: Downloading a new hardwar
e configuration to the reserve CPU (Page 316))
5. Follow the steps below
to remove an interface module from the subsystem of the reserve
CPU:
– Switch off the power supply of the reserve subsystem.
– Remove an IM460 from the central unit.
or
– Remove an expansion unit from an existing chain.
or
– Remove an external DP master interface module.
– Switch on the power supply of the reserve subsystem again.
6. Switch to CPU with altered configuration (see section STEP 7, step 5: Switching to CPU
with modified
configuration (Page 317))
7. Proceed a
s follows to remove a
n interface module from the subsystem of the original
master CPU (currently in STOP mode):
– Switch off the power supply of the reserve subsystem.
– Remove an IM460 from the central unit.
or
– Remove an expansion unit from an existing chain.
or
– Remove an external DP master interface module.
– Switch on the power supply of the reserve subsystem again.
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