Siemens SIMATIC TI555 User Manual

1-2
System Overview TI545/TI555 System Manual
1.1 Features
The TI545/TI555 CPUs and support equipment comprise a
computer -controlled system that is capable of controlling complex
manufacturing systems. This system performs the same functions as relays,
static control, or card logic control systems. It 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 TI545/TI555 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.
The TI545/TI555 systems offer the following features:
• Memory and I/O capacities and scan performance are summarized in
T able 1-1.
T able 1-1 TI545/TI555 Capacity/Per formance
Feature
TI545
–1102
TI555
–1101 –1102
User Memory (bytes) 192K 384K 1920K
EEPROM (EPROM) (bytes) 256K
Discrete I/O Points 2048
1
8192
2
Word I/O Points 1024
1
8192
2
Control Relays 32,768
Scan Performance
(milliseconds/KW, best case)
.67 .07
Notes:
1
T otal I/O count may not exceed 2,048 points.
2
T otal I/O count may not exceed 8,192 points.
• Optional password protection for user programs.
• Support for Report By Exception (RBE) when used as a control element
in a SIMA TIC PCS  System (Release 3.0 or later).
Features

Siemens SIMATIC TI555 Specifications

General

Brand	Siemens
Model	SIMATIC TI555
Category	Controller
Language	English