Allen Bradley 1747-L20C SLC 500 I/O Processor Unit

Product Introduction

The Allen-Bradley 1747-L20C I/O Processor Unit is a fixed hardware style controller within the SLC 500 family, designed for small to medium-scale industrial automation tasks that require reliable control, integrated I/O, and straightforward communication capabilities. This controller combines processing, memory, power supply, and I/O functions into a single compact unit, reducing system complexity and panel space requirements.

Equipped with 1K words of user memory, the 1747-L20C is well suited for discrete control, sequencing, and basic data handling applications. It supports DH-485 communication, enabling peer-to-peer data exchange, programming access, and networked control within SLC 500 systems. The built-in 24V DC digital inputs allow direct connection of field devices without the need for additional I/O modules.

Designed for continuous industrial operation, the 1747-L20C offers stable performance, predictable execution, and compatibility with legacy SLC 500 programming environments, making it an ideal choice for system upgrades, replacements, or dedicated control stations.

Product Specifications

Applications

• Standalone machine control for small automation systems

• Discrete manufacturing processes requiring reliable logic control

• Packaging, material handling, and assembly equipment

• Auxiliary control stations within larger SLC 500 networks

• Legacy system upgrades where fixed SLC 500 controllers are required

• Educational and training systems for PLC-based control

Advantages

• Integrated fixed-controller design reduces wiring and panel space

• Built-in digital inputs eliminate the need for additional I/O modules

• DH-485 communication support enables networked operation and diagnostics

• Stable SLC 500 architecture proven in long-term industrial use

• Simplified installation and maintenance due to all-in-one construction

• Compatible with existing SLC 500 programming tools

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