Siemens S5-100U User Manual page 20

2 Technical Description
2.1 Programmable Controller Design . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Principle of Operation for the Programmable Controller
2.2.1 Functional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Mode of Operation for the External I/O Bus
EWA 4NEB 812 6120-02
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