System modifications during operation
17.5 Adding components in STEP 7
S7-400H
304 System Manual, 03/2012, A5E00267695-11
Exceptions
This procedure for system modification does not apply in the following cases:
● To use free channels on an existing module
● For adding interface modules (see section Adding interface modules in STEP 7
(Page 311))
Note
After changing the hardware configuration, download takes place practically
automatically. This means that you no longer need to perform the steps described in
sections STEP 7, step 4: Stopping the reserve CPU (Page 306) to STEP 7, step 8:
Editing and downloadin
g the user program (Page 309). The system behavior remains as
described.
You will find more informa
tion in the HW Config online help "Download to module ->
Download station configuration in RUN mode".
17.5.1 STEP 7, step 1: Adding hardware
Starting situation
The fault-tolerant system is operating in redundant system mode.
Procedure
1. Add the new components to the system.
– Plug new central modules into the racks.
– Plug new module into existing modular DP stations
– Add new DP stations to existing DP master systems.
NOTICE
With switched I/O: Always complete all changes on one segment of the redundant
DP master system before you modify the next segment.
2. Connect the required sensors and actuators to the new components.
Result
The insertion of non-configured modules will have no effect on the user program. The same
applies to adding DP stations.
The fault-tolerant system continues to operate in redundant system mode.
New components are not yet addressed.
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