Siemens SIMATIC Manual page 11

Step
7 Press the release button on the front connector at the top of the module. At the same time,
push the front connector into the module until the release button snaps back into its initial
position.
Please note: If you are using 40-pin front connectors, they must also be fixed using the fixing
screw in the center of the front connector.
8 Close the front panels of the digital input and output modules and the power supply.
3. Commissioning the Hardware
Step
1 Connect the programming device to the CPU using the programming device cable. If you use a
cable with
PROFIBUS connectors, you will have to switch on the terminating resistors in the connectors.
Close the front flap on the CPU and set the mode selector switch to STOP.
2 Connect the power cable to the power supply and
switch on the power supply module.
3 Now insert either the micro memory card (MMC)
or the back–up battery into your CPU, depending on the CPU type.
4 Reset the CPU memory as follows:
– Press the mode selector switch to MRES. Hold the switch in this position until the
STOP LED lights up for the second time and stays on. Then release the mode selector
switch.
– Within 3 seconds, press the mode selector switch back to MRES. The STOP LED
starts to flash rapidly and the CPU memory is reset. You can now release the mode
selector. When the STOP LED lights up permanently again, the CPU memory reset is
complete.
5 Start up the programming device and start SIMATIC
Manager from the Windows desktop.
6 Activate switch 1.
7 Activate switch 2.
S7-300 Automation System CPU 31x: Commissioning
A5E00164278-02
Wiring the Front Connectors of the DI and DO
Tasks Result:
The DC24V-LED lights up on the
power supply module.
All the LEDs on the CPU light up brie-
fly; the SF LED and the DC5V LED
remain on. The STOP LED starts to
flash slowly, prompting a memory re-
set.
A SIMATIC Manager window opens.
The LED for the first input lights up.
The LED for the second input lights
up.
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