Multicomputing Interrupt; Configuring And Programming Multicomputing Operation - Siemens SIMATIC S7-400 Reference Manual

Interrupt Processing
The following applies to interrupt processing:
• Process interrupts and diagnostic interrupts are only sent to one CPU.
• When a module fails or is removed or inserted, the interrupt is processed by the
CPU that was assigned to the module at parameter assignment with STEP 7.
Exception: A module insertion/removal interrupt that starts from a CP reaches
all the CPUs even if the CP was assigned to a CPU at configuration with
STEP 7.
• In the event of a rack failure, OB 86 is called on each CPU, including CPUs that
were not assigned a module in the failed rack.
You can find further information on the OB 86 in the reference information on
organization blocks.
Typical I/O Application Specification
The typical I/O application specification of a programmable controller corresponds
in multicomputing operation to the typical application specification of the CPU with
the most resources. The relevant CPU-specific or DP master-specific typical
application specifications cannot be exceeded in the individual CPUs.
1.9.2

Multicomputing Interrupt

Using the multicomputing interrupt (OB 60), you can respond synchronously to an
event in multicomputing on the corresponding CPUs. In contrast to the process
interrupts triggered by signal modules, the multicomputing interrupt can be output
only by CPUs. The multicomputing interrupt is triggered by calling SFC 35
"MP_ALM".
You will find more information in the System Software for S7-300/400, System and
Standard Functions manual.
1.9.3

Configuring and Programming Multicomputing Operation

Please refer to the manual Configuring Hardware and Communication Connections
with STEP 7 V5.2 to find out how to configure and program the CPUs and the
modules.
Automation System S7-400 CPU Specifications
A5E00165965-01
Structure of a CPU 41x
1-29