Excellent PLC
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
| Parameter | Description |
|---|---|
| Product Type | Fixed Hardware Style I/O Processor Unit |
| Controller Series | Allen-Bradley SLC 500 |
| Memory Capacity | 1K words user memory |
| Controller Architecture | Integrated CPU, I/O, and power supply |
| Digital Inputs | 12 points, 24V DC |
| Input Type | Sourcing / sinking compatible |
| Communication Interface | DH-485 |
| Programming Method | SLC 500 programming software |
| Power Supply Type | Integrated |
| Input Power | 120 / 240 VAC |
| Control Functions | Discrete control, sequencing, basic logic |
| Installation Type | Panel-mounted fixed controller |
| Dimensions | 165 × 158 × 145 mm |
| Weight | 1.36 kg |
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
