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Synchronous Operation of Multiple CPUs (Multicomputing)

Configuring Hardware and Communication Connections with STEP 7

A5E00706939-01

8-3

8.1.1 Special Features of Multicomputing

Slot Rules

In multicomputing mode up to four CPUs can be inserted simultaneously in a

central rack in any order.

If you use CPUs that can manage only module start addresses that are divisible by

four (generally CPUs before 10/98), you must follow this rule for all configured

CPUs when you assign the addresses. The rule applies to a case where you are

also using CPUs that permit byte-by-byte assignment of module start addresses in

single-computing operation.

Bus Connection

The CPUs are interconnected via the communication bus (corresponds to a

connection via MPI).

Behavior During Startup and Operation

During startup the CPUs in multicomputing operation check automatically whether

they can synchronize. Synchronization is only possible:

• If all (and only) the configured CPUs are inserted and not defective

• If correct configuration data (SDBs) were created and downloaded for all

inserted CPUs.

If one of these prerequisites is not met, the event is entered in the diagnostic

buffer under the ID 0x49A4. You will find explanations of the event IDs in the

reference online help on standard and system functions (SFBs/SFCs).

When the CPUs exit STOP mode, the startup types are compared (COLD

RESTART/WARM RESTART/HOT RESTART). This ensures that all the CPUs in

the programmable controller execute the same type of startup and all CPUs have

the same operating mode.

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Siemens S7-400 Manual de Serviço Página 207