Siemens 928B System Manual

5-42 System ManualC79000-G8576-C199-075.4 CPU 928BThis section contains the hardware description and technical specifications ofthe CPU 928B.Details on programming the CPU 928B can be found in theCPU 928B Programming Guide.5.4.1 Technical DescriptionYou can use the CPU 928B in single and multiprocessor operation in theS5-135U/155U central controller (see Chapter 6). Up to four CPUs can beused.The CPU 928B is universally applicable, ensuring both very fastbit processing and very fast word processing: Cyclic Time-controlled (9 different timebases) Real-time controlled Interrupt-driven (hardware interrupt) Delayed (from Version 6ES5 928-3UB12)The programming language is STEP 5.The electronic circuitry of the CPU 928B is on two PCBs (basic andexpansion boards) in the double Eurocard format. Both PCBs are screwedtogether, linked via connectors, and must not be separated. The basic boardprovides the connection to the S5 bus via two backplane connectors.The front plate width is 2 2/3 standard plug-in stations.ApplicationDesignCPUs, Memory Cards, Memory Submodules, Interface Submodules