Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 174

Maintenance
9.6 Module installation / removal
Putting a new module into service
Proceed as follows to put the new module into service:
1. Open the front panel.
2. Reinstall the front connector.
3. Close the front panel.
4. Switch the load voltage back on.
5. Reset the CPU to RUN mode.
P S
The figure illustrates the described steps:
(1)
(2)
Reaction of the S7-300 after module replacement
After a module replacement, the CPU switches to run mode, provided no error has occurred.
If the CPU stays in STOP, you can view the cause of error in STEP 7 (see the
manual).
9-10
C P U
1
Move the front connector into operating position
Close front panel.
2
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
STEP 7
User