Siemens S5-135U/155U - Manual (Page 170)

5-30
System Manual
C79000-G8576-C199-06
5.3 CPU 928B -3UB21
This section contains the hardware description and technical specifications of
the CPU 928B -3UB21.
Details on programming the CPU 928B -3UB21 can be found in the
CPU 928B -3UB21 Programming Guide.
5.3.1 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.
The following program processing levels are possible:
S
Cyclic
S
Time-controlled (9 different timebases)
S
Real-time controlled
S
Interrupt-driven (hardware interrupt)
S
Delayed
The programming language is STEP 5.
The electronic circuitry of the CPU 928B is on one PCB in the double
Eurocard format. The board provides the connection to the S5 bus via two
backplane connectors.
The front plate width is 1 1/3 standard plug-in stations.
Application
Design
CPUs, Memory Cards, Memory Submodules, Interface Submodules