Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 146

Commissioning
8.4 Commissioning the Modules
Modifying outputs in CPU STOP mode
The function Enable PO resets the output disable signal for the peripheral outputs (PO),
thus enabling modifying of the PO in CPU STOP mode.
In order to enable the POs, proceed as follows:
1. In menu item Table > Open the variable table (VAT), open the VAT that contains the PO
2. To modify the PO of the active VAT, select the CPU connection in menu command PLC
3. Use menu command PLC > Operating Mode to open the Operating Mode dialog and
4. Enter your values in the "Modify value" column for the PO you want to modify.
5. Select Variable > Enable PO to set "Enable PO" mode.
6. Modify the PO by selecting Variable > Activate Modify Values. "Enable PO" mode
7. Return to step 4 if you want to set new values.
8-22
you want to modify, or activate the window containing the corresponding VAT.
> Connect to ... .
switch the CPU to STOP mode.
Examples:
PO: POB 7 modify value: 2#0100 0011
POW 2 W#16#0027
POD 4 DW#16#0001
remains active until reset by selecting Variable > Enable PO once again.
"Enable PO" is also terminated when the connection to the PG goes down.
Note
For example, a message pops up to indicate a CPU mode transition from STOP to RUN
or START-UP.
A message also pops up when the "Enable PO" function is set while the CPU is in RUN
mode.
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05