Siemens SIMATIC S7-400H - Page 270

Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
S7-400H
270 System Manual, 03/2012, A5E00267695-11
Step What has to be done? How does the system react?
1 Disconnect the module from its peripheral
power supply, if necessary.
2 Disconnect the front connector and wiring.
 Call OB 82 if the module concerned is
capable of diagnostic interrupts and
diagnostic interrupts are enabled in the
configuration.
 Call OB 122 if you are accessing the
module by direct access
 Call OB 85 if you are accessing the
module using the process image
3 Remove the failed module (in RUN mode).
 Both CPUs process the swapping
interrupt OB 83 synchronized with each
other.
4 Insert the new module.
 Both CPUs process the swapping
interrupt OB 83 synchronized with each
other.
 Parameters are assigned automatically
to the module by the CPU concerned
and the module is addressed again.
5 Plug the front connector into the new
module.
 Call OB 82 if the module concerned is
capable of diagnostic interrupts and
diagnostic interrupts are enabled in the
configuration.