Siemens S5-100U - Principle of Operation for the Programmable Controller

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