Allen-Bradley SLC 500 1747-L20 User Manual

Installation Instructions
SLC 500™ Fixed Hardware Style
Controllers
(Catalog Numbers 1747-L20, 1747-L30, and 1747-L40)
Inside… page
English Section....................................................................................... 3
Section en français............................................................................... 23
Deutscher Abschnitt............................................................................. 43
Sezione italiana.................................................................................... 63
Sección en español............................................................................... 83
Physical Dimensions........................................................................... 103
Wiring Diagrams................................................................................. 104
AB Drives

Allen-Bradley SLC 500 1747-L20 Specifications

General

Model	1747-L20
Series	SLC 500
Program Memory	4K Words
Data Memory	4K Words
Operating Voltage	120/240V AC
Communication Ports	RS-232

Summary

Important User Information

For More Information

Related Publications

Lists additional documentation and resources for the SLC 500 system.

Safety Considerations

High Voltages and Electrical Hazards

Warns about dangerous voltage levels present in the controller.

Installation and Mounting

Controller Spacing Requirements

Specifies minimum spacing for proper controller ventilation and cooling.

Mounting the Expansion Chassis

Step-by-step guide for attaching the optional 2-slot chassis.

Mounting Your Controller

Configuring the High-Speed Counter

Grounding Your Controller

Wiring Your Controller

Understanding LED Indicators

Identifying Controller LED Status Messages

Decodes LED lights to diagnose controller status and potential issues.

Configuration Options

General Specifications

Input Specifications

Output Specifications

Relay and Surge Suppression Details

Relay Contact Ratings

Specifies the voltage and current limits for relay contacts under different conditions.

Using Surge Suppressors

Recommendations and methods for applying surge suppression to protect output contacts.

Physical Dimensions

Wiring Diagram Locations