The 1756-L81EP ControlLogix 5580 Process Controller from Rockwell Automation is a high-performance industrial PLC/PAC designed for process-heavy automation systems requiring integrated Ethernet communication, enhanced diagnostics, and harsh-environment capability.
It belongs to the ControlLogix 5580 process controller family and is widely used in process industries, chemical plants, energy systems, and large-scale distributed control systems (DCS). The “EP” variant is especially designed for process applications with enhanced environmental and communication features.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-L81EP |
| Series | ControlLogix 5580 Process |
| Processor Type | PLC / PAC Controller |
| User Memory | 3 MB |
| I/O Capacity | Up to 128,000 digital / 4,000 analog |
| Controller Tasks | Up to 32 tasks |
| Programs per Task | Up to 1000 programs |
| Communication Ports | 1 × USB, 1 × Embedded EtherNet/IP |
| Ethernet Speed | 10/100/1000 Mbps (Gigabit) |
| Motion Control | Supported (system-dependent) |
| Display | 4-character alpha-numeric status display |
| Backplane Current (5.1V DC) | ~1.2 A |
| Power Dissipation | ~6 W |
| Programming Software | Studio 5000 Logix Designer |
| Security Features | Signed firmware, role-based access control |
| Operating Temperature | -25°C to 70°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Weight | ~0.25–0.65 kg (varies by configuration) |
Physical Dimensions
- Size (H × W × D): 237.5 × 183 × 55 mm
This elongated chassis footprint is designed for process-grade ControlLogix 5580 configurations, especially in systems requiring enhanced environmental robustness and modular process control integration.
Recommended Related Models
For expansion and system design, the L81EP is commonly paired with:
- 1756-L82E / 1756-L83E higher-memory ControlLogix 5580 CPUs
- 1756-EN2T EtherNet/IP communication module (legacy integration)
- 1756-IB16 / 1756-OB16 digital I/O modules
- 1756-IF8 / OF8 analog I/O modules
- 1756-PB75 / 1756-PA75 power supply modules
Popular Allen-Bradley ControlLogix Models
Within the same platform ecosystem, commonly used controllers include:
- 1756-L71 / L72 / L73 ControlLogix 5570 CPUs
- 1756-L73S GuardLogix safety controllers
- 1756-L81E / L82E / L83E ControlLogix 5580 CPUs
- 1756-L81EP process-oriented controllers
- 1756-L8SP safety partner modules
These controllers support scalable architectures ranging from discrete automation to full process control systems.
