Siemens S5-135U/155U System Manual page 272

Multiprocessor Operation/Coordinators
Step 6
Loading STEP 5 user programs in all CPUs:
For details of loading STEP 5 blocks and using the different types of
memory, please consult the relevant Programming Guides of the CPUs and
your PG Manual.
Data block DB 1 must be present for I/O allocation.
Data block DX 0 must additionally be present at
CPU 948.
The mode for "Process interrupts via IB 0 = off" must
be set in DX 0.
To start multiprocessor operation immediately with all
CPU programs, you must now load your programs into
the individual CPUs.
After completing these steps, however, you can load
individual programs into certain CPUs.
1.
There is no change in the reactions of Step 4 (each CPU still emits the
output inhibit signal: the BASP LED is continuously lit).
6-10
Recommended precondition: The programs of the individual CPUs have
already been tested in single-processor operation.
What?
You must only load the blocks for CPUs with RAM operations; for EPROM operation, the
inserted EPROMs must contain your user program with DB 1 (DX 0).
Data blocks which you have provided for dynamic data storage must be copied after a
RESET by program into the RAM.
Prerequisites
Reaction
C79000-G8576-C199-06
Where?
in all
1)
CPUs
only in
CPU 948
into the
desired
1)
CPU
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