Plant changes during redundant operation - H-CiR
12.9 Removal of components
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
211
12.8.5
Use of free channels on an existing module
The use of previously free channels of an I/O module depends mainly on the fact if the
module can be configured or not.
Non-configurable modules
Free channels can be switched and used in the user program at any time in case of non-
configurable modules.
Configurable modules
The hardware configuration first has to be matched to the used sensors or actuators for
configurable modules. This step usually requires a new configuration of the entire module in
most cases.
This means an uninterrupted operation of the respective modules is no longer possible:
●
One-sided output modules briefly output 0 during this time (instead of the configured
substitute or hold values).
●
Modules in switched DP stations are not reconfigured when you switch over to the CPU
with the modified configuration.
Proceed as follows to change the channel use:
●
First, the affected module is completely removed from the hardware configuration and the
user program. But it can remain inserted in the DP station. The module drivers must not
be removed.
●
After this, the module with the modified use is added again to the hardware configuration
and the user program.
Note
Between these two switchover actions, affected modules are not accessed; affected
output modules have a value of 0. The existing channel drivers in the user program hold
their signals.
If this behavior is unacceptable for the process to be controlled, there is no other way to
use previously free channels. In this case you must install additional modules to expand
the system.
12.9
Removal of components
Starting situation
You have ensured that the CPU parameters (for example the monitoring times) are
compatible with the planned new program. You may first need to modify the CPU
parameters (see Editing CPU parameters (Page 217)).
