Siemens S5-135U/155U - Manual (Page 182)

5-42
System Manual
C79000-G8576-C199-06
5.4 CPU 928B
This section contains the hardware description and technical specifications of
the CPU 928B.
Details on programming the CPU 928B can be found in the CPU 928B
Programming Guide.
5.4.1 Technical Description
You can use the CPU 928B in single and multiprocessor operation in the
S5-135U/155U central controller (see Chapter 6). Up to four CPUs can be
used.
The CPU 928B is universally applicable, ensuring both very fast bit
processing and very fast word processing:
S
Cyclic
S
Time-controlled (9 different timebases)
S
Real-time controlled
S
Interrupt-driven (hardware interrupt)
S
Delayed (from Version 6ES5 928-3UB12)
The programming language is STEP 5.
The electronic circuitry of the CPU 928B is on two PCBs (basic and
expansion boards) in the double Eurocard format. Both PCBs are screwed
together, linked via connectors, and must not be separated. The basic board
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