Siemens S5-135U/155U 用户手册

5-51

System Manual
C79000-G8576-C199-06

The modules must be inserted at the correct slots in the central controller.
The backup battery must be fitted and in order for the CPU to start.

1

Set the mode switch to STOP.

2

Switch the system voltage on.

The following LEDs must light
up on the CPU:
–

Red STOP LED (flashing
rapidly)

–

Red BASP

2) 

LED

3

Hold the MC

1)

 switch in the

OVERALL RESET setting
and simultaneously set the
mode switch from STOP to
RUN.

The red STOP LED is now
permanently lit.

1)

MC: Momentary-contact

2)

BASP: Command output inhibit

1

Set the mode switch to STOP.

2

Hold the MC switch in the
RESET setting and
simultaneously set the mode
switch from STOP to RUN.

–

Red STOP LED goes off 

–

Green RUN LED lights up

–

Red BASP LED goes off

The CPU is now in the RUN state
but still has no user program.

You can also carry out a manual restart of the CPU 928B with the mode
switch. The CPU 928B Programming Guide will indicate when a manual
restart is permissible.

3

Set the mode switch from
STOP to RUN.

–

Red STOP LED goes off 

–

Green RUN LED lights up

–

Red BASP LED goes off

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.

CPUs, Memory Cards, Memory Submodules, Interface Submodules