Siemens S5-135U/155U - Manual (Page 202)

5-62
System Manual
C79000-G8576-C199-06
5.6 CPU 928
This section contains the hardware description and technical specifications of
the CPU 928.
Details on programming the CPU 928 can be found in the CPU 928
Programming Guide.
5.6.1 Technical Description
You can use the CPU 928 in single and multiprocessor operation in the
S5-135U/155U central controller (see Chapter 6). Up to four CPUs can be
used.
The CPU 928 is universally applicable, ensuring both very fast bit processing
(optimized for open-loop tasks) and word processing (optimized for
closed-loop tasks).
The following program processing levels are possible:
S
Cyclical
S
Time-controlled (9 different timebases)
S
Interrupt-driven (hardware interrupt)
The programming language is STEP 5.
The CPU 928 comprises two PCBs (PCB 1 and PCB 2) in the double
Eurocard format, in a sandwich assembly. The two PCBs have plug-in
interconnections and are bolted together as a unit when delivered. PCB 2
serves as the basic board which provides the connection to the S5 bus via two
backplane connectors.
The front plate width is 2 2/3 standard plug-in stations.
Application
Design
CPUs, Memory Cards, Memory Submodules, Interface Submodules