Siemens S7-300 Installation Manual page 124

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• You must have installed and wired up the S7-300.
• Your CPU's mode selector switch must be set to STOP.
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The CPU 312 IFM has no memory card, but it is covered in this section.
Switch on the PS 307 power supply module.
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• The 24 VDC LED on the power supply module is lit.
• The 5 VDC LED on the CPU
is lit.
–
The STOP LED flashes at 2 Hz when the CPU executes an automatic
–
memory reset.
The STOP LED is lit after memory reset.
–
The BATF LED is lit if the back-up battery is missing in the CPU (not with
CPU 312 IFM, since not buffered).
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If you insert a Memory Card and a back-up battery before power is on, the CPU
also requests a memory reset after start-up.
9-12
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01