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- 1747-L20C
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- USA
- 17.8 × 15.2 × 15.2 cm
- 1.36kg
- Xiamen, China
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Allen Bradley 1747-L20C Detailed Product Introduction and Technical Specifications
Product Overview
The Allen Bradley 1747-L20C is a fixed-style programmable controller belonging to the SLC 500 PLC family. It integrates processor, input/output channels, and communication capability into a compact single-unit controller.
This model is designed for small to medium industrial automation applications where limited I/O points are required but stable control performance is still essential.
The controller includes embedded digital inputs and relay outputs, making it suitable for standalone machine control without requiring extensive external I/O modules.
It is widely used in industrial machinery, packaging systems, conveyor control, material handling equipment, and basic process automation systems.
The 1747-L20C represents a cost-effective PLC solution for systems that do not require large-scale expansion but still demand industrial reliability and stable operation.
Brand Information
| Item | Details |
|---|---|
| Brand | Allen Bradley |
| Product Model | 1747-L20C |
| Product Type | Fixed Hardware PLC Controller |
| Product Family | SLC 500 Series |
| Series | SLC 500 Series |
| Main Function | Integrated PLC Control Unit |
| Communication | DH-485 (Slave Mode) |
| Installation Type | Fixed Base Controller |
Product Series Introduction
SLC 500 Series
The SLC 500 series is a modular PLC platform designed for industrial automation and machine control applications.
It combines processors, I/O modules, communication interfaces, and power systems into a flexible control architecture.
The series is known for stability, long service life, and wide industrial adoption in legacy automation systems.
The 1747-L20C belongs to the fixed controller segment of the SLC 500 series, where CPU and I/O are integrated into a single compact unit for simplified control applications.
Detailed Technical Specifications of 1747-L20C
Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1747-L20C |
| Product Type | Fixed PLC Controller |
| Series | SLC 500 |
| Program Memory | 1K Instructions |
| Input Channels | 12 × 24V DC Sink Inputs |
| Output Channels | 8 × Relay Outputs (AC/DC) |
| Power Supply Voltage | 85–265V AC |
| Frequency Range | 47–63 Hz |
| Backplane Power | 24V DC User Power (200 mA) |
| Communication Port | DH-485 (Slave Mode) |
| Scan Time | 8 ms / 1K instructions |
| Bit Execution Time | 4 microseconds |
| High-Speed Counter | Supported |
| Memory Type | Capacitor-backed RAM |
| Backup Option | EEPROM / UVPROM |
| Fuse Protection | 1.25A |
| Cable Type | Belden 9463 |
| Connector Type | 6-Pin Phoenix Connector |
| LED Indicators | Power / Run / Fault / I/O / Battery |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% (non-condensing) |
| Shock Resistance | Industrial Grade |
| Dimensions | 17.8 × 15.2 × 15.2 cm |
| Weight (kg) | 1.36 kg |
Product Features
1. Integrated Compact PLC Design
The 1747-L20C combines CPU, I/O, and power interface into a single compact controller.
This reduces cabinet space requirements and simplifies system wiring compared to modular PLC systems.
2. Built-in Digital I/O Capability
The controller includes 12 digital inputs and 8 relay outputs.
This allows direct connection to sensors, switches, motors, and actuators without additional modules.
3. Stable Industrial Control Performance
With a scan time of 8 ms per 1K instructions, the controller provides stable real-time control for small automation systems.
It is suitable for applications requiring predictable and consistent logic execution.
4. DH-485 Communication Support
The built-in DH-485 port allows communication with programming devices and other PLC systems.
It is commonly used for system monitoring and program upload/download functions.
5. High-Speed Counter Function
The controller supports high-speed counting functions, making it suitable for applications such as product counting, speed detection, and position tracking.
6. Industrial-Grade Reliability
The unit is designed for harsh industrial environments, supporting temperature variation, electrical noise, and continuous operation.
It provides long-term stable performance in factory automation systems.
Product Applications
Packaging Machinery
Used for controlling sealing machines, labeling machines, and filling systems requiring basic automation logic.
Conveyor Systems
Controls start/stop logic, product counting, and simple conveyor synchronization in material handling systems.
Small Manufacturing Equipment
Suitable for small production machines requiring limited I/O and stable control performance.
Industrial Automation Training Systems
Widely used in training environments due to its simple structure and easy programming interface.
Legacy Industrial Systems
Commonly found in older automation installations where system upgrades have not been performed.
Product Advantages
| Advantage | Description |
|---|---|
| Compact Design | Combines CPU and I/O in one unit |
| Cost-Effective | Suitable for small automation systems |
| Simple Installation | Reduced wiring complexity |
| Stable Performance | Reliable PLC execution cycle |
| Built-in I/O | No need for external modules |
| High Durability | Industrial-grade construction |
| Easy Maintenance | Clear LED status indicators |
| Legacy Compatibility | Works with SLC 500 ecosystem |
Recommended Models from the Same Series or Related Series
SLC 500 Controller & Communication Family
| Model | Product Type | Main Function | Application | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1747-L20C | Fixed PLC Controller | Integrated control unit | Small automation systems | 17.8 × 15.2 × 15.2 cm | 1.36 kg |
| 1747-L30C | Fixed PLC Controller | Larger I/O capacity | Medium machines | 17.8 × 15.2 × 15.2 cm | 1.40 kg |
| 1747-L40A | Modular Processor | Expanded control capability | Industrial automation | 18 × 15 × 16 cm | 1.50 kg |
| 1747-L541 | Advanced CPU Module | High-performance processing | Process control | 20 × 16 × 17 cm | 1.80 kg |
| 1747-L553 | High-end CPU | Network-enabled PLC | Complex systems | 21 × 17 × 18 cm | 2.10 kg |
Recommended Popular Models from the Same Brand
Widely Used Industrial Automation Products
| Model | Product Category | Main Features | Application Area | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 1756-EN2TR | Ethernet Module | Dual Ethernet ports | Industrial networking | 14 × 11 × 8 cm | 0.45 kg |
| 1769-L33ER | Compact PLC | Built-in Ethernet/IP | Machine control | 18 × 12 × 9 cm | 0.92 kg |
| 1756-IB16 | Input Module | 16 digital inputs | Factory automation | 15 × 11 × 6 cm | 0.30 kg |
| 1769-IF8 | Analog Module | 8-channel analog input | Process control | 12 × 9 × 5 cm | 0.35 kg |
| 1783-US8T | Ethernet Switch | Industrial network switch | Communication systems | 16 × 12 × 5 cm | 0.80 kg |
Communication and System Role
The 1747-L20C functions as a standalone PLC controller within the SLC 500 system architecture.
It executes control logic, processes input signals, and drives output devices directly.
Its built-in DH-485 communication allows basic integration with programming tools and other controllers.
This makes it suitable for compact automation systems without requiring a full modular PLC structure.
Installation and Maintenance Characteristics
The controller is installed as a fixed unit in industrial control panels.
Wiring is simplified due to integrated I/O terminals.
LED indicators provide clear system status including power, run, fault, and I/O conditions.
Maintenance is minimal due to its integrated architecture and stable hardware design.
Industrial Reliability
The 1747-L20C is designed for long-term industrial use in stable and moderately demanding environments.
It is widely used in legacy systems due to its durability and simple structure.
Even in older installations, it continues to provide reliable control performance for basic automation tasks.
Summary
The Allen Bradley 1747-L20C is a compact fixed PLC controller within the SLC 500 series.
It integrates CPU and I/O into a single unit, providing simple yet reliable automation control for small industrial systems.
Its stability, ease of use, and long service life make it a practical solution for basic machine control applications and legacy automation systems.