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System Overview SIMATIC 545/555/575 System Manual
1.1 Overview
This manual describes SIMATIC 545, 555, and 575 programmable control
systems and encompasses the following CPU models:
• PPX:545–1103, –1104, –1105, –1106
• PPX:555–1103, –1104, –1105, –1106
• PPX:575–2104, –2105, –2106
NOTE: In this manual, a feature, unless it is explicitly restricted, applies to
all systems.
The CPU models are distinguished by capacity and speed and by various
optional features. The –1103 and –1104 models of the 545 and 555 CPUs are
older models that will be superseded by the newer models –1105 and –1106.
However, all share the same programming standards, and all offer access to
PROFIBUS-DP I/O.
The systems that are described in this manual are designed for use in a
broad range of applications, including those that require discrete and analog
control. Components include the CPU and the support devices that provide
operator interface, communication, I/O control, and power.
The CPUs and their support equipment comprise computer-controlled
systems that are capable of controlling complex manufacturing systems.
These systems perform the same functions as relays, static control, or card
logic control systems. They can detect the change in state of input signals
from such devices as pushbuttons, limit switches, and analog sensors.
Acting on this information and executing a relay ladder logic (RLL) program
stored in memory, the CPU produces output signals to drive motor starters,
solenoids, pilot lights, modulating control valves, etc. These signals are used
to regulate the operation of various pieces of equipment.
A full line of discrete, analog, word, and intelligent I/O modules are
available for handling almost any input or output specification. These I/O
modules are rugged, plug-in devices capable of functioning within operating
specifications in harsh environments.
Current 545 and 555 CPUs are fully software-compatible with previous 545
and 555 CPUs. However the early model 545–1101 has a female connector
and a different electronic pinout on RS-232 port 2 compared to all other 545
and 555 CPU models, which have a male connector.
Introduction
Compatibility with
Previous CPUs
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