Siemens S5-155U System Manual page 166

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You can also carry out a manual restart of the CPU 948 with the mode

switch. The CPU 948 Programming Guide will indicate when a

manual restart is permissible.

Set the mode switch from

For maintenance purposes or in the event of a fault, this startup

without user program in single-processor operation can serve to

establish whether the CPU is operating without errors.

Red STOP LED goes off

RUN LED lights up

Red BASP LED goes off

System Manual

C79000-B8576-C199-03

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