Principle Of Operation For The Programmable Controller - Siemens SIMATIC S5-100U System Manual

S5-100U
2.2

Principle of Operation for the Programmable Controller

The remainder of this chapter explains how your S5-100U processes your program.
2.2.1 Functional Units
CPU
Program
Timers
memory
ROM
(
operating
system)
ALU
(ACCU 1 and 2,
bit-ACCU (RLO))
Digital
modules:
- input
- output
*
Beginning with CPU 103, version 8MA02
EWA 4NEB 812 6120-02b
Counters Flags
RAM
Processor
I/O bus
Analog
modules:
- input
- output
Figure 2-2. Functional Units of the S5-100U
Technical Description
Interrupt
Process
process System
I/O image
I/O image
tables
*
tables
Memory
submodule
Serial
port
Function
modules
I/O modules
data
2-3