Siemens S5-135U/155U appendix CPU 928B -3UB21

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.3CPU 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.

5.3.1Technical Description

Application	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.
Design	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.

5-30	System Manual
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