Siemens CPU 313C Hardware And Installation Manual page 124

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• You must have installed and wired up the S7-300.
• The MMC is inserted in the CPU.
• Your CPU's mode selector switch must be set to STOP.
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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.
–
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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