CPU Function, depending on CPU and STEP 7 Version
4-4
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
OP 25
RS 485
repeater
S7-300
S7-300
S7-300
S7-300 with CPU 316
OP 25
PG
PG
FM FM
The CPU 316 is replaced
with a CPU 318-2
FM
Figure 4-1 Sample Configuration
After the CPUs have been swapped, you must proceed as follows (based on the
above example):
Replace the CPU 316 with the CPU 318-2 in the STEP 7 project.
Reconfigure the operator panel/programming device. That means: Reassign the
controls and start address (= MPI address of CPU 318-2 and the respective FM
slot)
Reconfigure the configuration data for the FM/CP to be loaded onto the CPU.
This is necessary to ensure that the FM/CP in this configuration remain accessible
to the operator panel/programming device.
Inserting and Removing a Memory Card (FEPROM)
If you remove a Memory Card and insert a card in with identical content in POWER
OFF state (CPU is not buffered), the result after POWER ON is:
CPU 318-2 CPUs 312IFM to 316-2DP
The CPU 318-2 goes into STOP mode and
request a memory reset.
The CPU switches to the mode it was in
prior to POWER OFF, i.e. RUN or STOP.
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