The 1756-L81E ControlLogix 5580 Processor Module from Rockwell Automation is a next-generation high-performance PLC/PAC controller designed for modern industrial automation systems requiring high-speed processing, integrated Ethernet communication, advanced cybersecurity, and scalable control architecture.
As part of the ControlLogix 5580 platform, the L81E represents a major evolution over the 5570 series, featuring an embedded Gigabit Ethernet port, improved memory structure, and enhanced diagnostic and security capabilities. It is widely used in advanced manufacturing, digital factories, and IIoT-enabled industrial environments.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-L81E |
| Series | ControlLogix 5580 |
| Processor Type | PLC / PAC Controller |
| User Memory | 3 MB |
| Nonvolatile Memory | Secure Digital (SD card support, up to 2 GB typical) |
| Communication Ports | 1 × USB, 1 × Embedded EtherNet/IP (Gigabit) |
| Ethernet Speed | 10/100/1000 Mbps |
| Maximum I/O Capacity | Up to 128,000 digital / 4,000 analog |
| Controller Tasks | Up to 32 tasks |
| Programs per Task | Up to 1000 programs |
| Motion Control | Supported (high-performance coordinated motion) |
| Security Features | Role-based access control, signed firmware, change detection |
| Backplane Current (5.1V DC) | ~1.2 A |
| Power Dissipation | ~6.2 W |
| Isolation Voltage | 50 V continuous |
| Programming Software | Studio 5000 Logix Designer |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Weight | ~2 kg (shipping weight typical) |
Physical Dimensions
- Size (H × W × D): 145.2 × 34.55 × 136.6 mm
This compact single-slot design integrates a built-in Ethernet interface while maintaining full ControlLogix chassis compatibility.
Recommended Related Models
For system expansion and industrial networking, the L81E is commonly paired with:
- 1756-L82E / 1756-L83E higher-memory ControlLogix 5580 CPUs
- 1756-EN2T EtherNet/IP communication module (legacy systems)
- 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 broader ControlLogix ecosystem, commonly used controllers include:
- 1756-L71 / L72 / L73 ControlLogix 5570 CPUs
- 1756-L73S / L72S GuardLogix safety controllers
- 1756-L81E / L82E / L83E ControlLogix 5580 CPUs
- 1756-L8SP safety partner modules
- 1756-EN2T high-speed Ethernet communication modules
These controllers support scalable architectures from legacy migration to modern smart factory systems.
