Siemens S5-135U/155U appendix CPU 928 -3UA21, Closed-loop tasks, Cyclical

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.5CPU 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.

5.5.1Technical 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:
	S Cyclical
	S Time-controlled (9 different timebases)
	S Interrupt-driven (hardware interrupt)
	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	System Manual
	C79000-G8576-C199-06