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Multiprocessor Mode
10.1 Multiprocessor Mode
Definitions of terms
10.1.1
When to use the
Multiprocessor Mode
10.1.2
What Communications
Mechanisms are Available?
10 - 4
The S5-155U is set up for multiprocessor operation as soon as you
plug in a coordinator module, regardless of how many CPUs or
CP/IPs are plugged in. The CPUs must be plugged in without any
gaps between them.
• • If your user program is too large for one CPU and there is not
enough memory, distribute your program on several CPUs.
• • When a particular part of your system has to be processed
especially fast, separate the appropriate program part from the total
program and run it on its own fast CPU.
• • When your system consists of several parts that you can separate
easily and control independently, let CPU 1 process system part 1,
CPU 2 process system part 2, etc.
For more information on multiprocessing, read the information in your
system manual. This will help you to decide which CPUs are best suited
for your problem.
• • "Interprocessor communication flags" are available for cyclic
exchange of binary data between CPUs (CPU 948, CPU 946/947,
CPU 928B, CPU 928 and CPU 922) or between CPUs and
communications processors (CPs).
• • For the exchange of large amounts of data (e.g., entire data blocks)
between the CPU 948, CPU 946/947, CPU 928B, CPU 928 and
CPU 922 you are supported by the "special functions for
multiprocessing" OB 200 to OB 205 (for more information refer to
Section 10.2).
• • "Handling blocks" are available for communication with
intelligent input/output modules (IPs) and with CPs (These
handling blocks must be ordered separately).
CPU 948 Programming Guide
C79000-G8576-C848-04
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