siemens s5 faults

hi lads,
i have a problem with my siemens plc, it will noty go back into run mode and the basp fault led is lit ! what would be causing this and how do i resolve it 1



thanks garrett

Connect up your programmer and examine the stack. There are various status bits and one of these should tell you why the CPU has stopped. IIRC the basp led tells you that all the outputs are disabled.

garret said:

hi lads,
i have a problem with my siemens plc, it will noty go back into run mode and the basp fault led is lit ! what would be causing this and how do i resolve it 1



thanks garrett

Click to expand...

I think you have problem with your RESTART MODE:nodi:


The RESTART mode is the transition from the STOP mode to the RUN mode.It has the following features:

1. The five types of RESTART mode are the following:manual cold
restart,automatic cold restart,manual warm restart,automatic
warm restart & retentive cold restart.

You can select or preset these start-up types using one of the
following methods:
- Activate the RUN/STOP & (for cold restart)RESET switches
- Use program functions
- Assign parameters in DX 0

After a cold restart, the system program processes the cyclic
user program from the beginning.

After a warm restart,user program processing is resumed from
the point at which it was interrupted.

2. For manual or an automatic cold restart and for a manual or
automatic warm restart,the system program calls special
organization blocks in which you can program a specific start-
up program.These organization blocks are OB 20, OB 21, & OB 22
The lenght of the STEP5 start-up program in the OBs is not
restricted.It is not time monitored.Other blocks can be called
in the start-up OBs.

3. Timers are activated before the system program calls start-up
organization blocks.

4. In each start-up type,the value of counters, timers, flags,and
process images are handled differently

5. The disable output command signal (BASP) is active.This
disables all digital outputs.

Exception: The BASP signal is active during test operation

6. The interrupts (internal time intterupts, external process
interrupts/HW signal interrupts) are disable.


Regards:

Sherwin

If you look at the stack it will tell you what block was being processed at the time of the error & if it is a programming errorit will display the address before the error i.e. blk stp: 0A0F

There are others off memory like called db does not exist, I/O error timeout (cycle time exceeded) etc.