Cpu 928 -3Ua21; Technical Description - Siemens S5-135U/155U System Manual

CPUs, Memory Cards, Memory Submodules, Interface Submodules
5.5

CPU 928 -3UA21

This section contains the hardware description and technical specifications of
the CPU 928 -3UA21.
Details on programming the CPU 928 can be found in the CPU 928
Programming Guide.
5.5.1

Technical Description

Application
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:
The programming language is STEP 5.
Design
The electronic circuitry of the CPU 928 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.
5-54
Cyclical
Time-controlled (9 different timebases)
Interrupt-driven (hardware interrupt)
System Manual
C79000-G8576-C199-06