The 1756-L1M2 ControlLogix 5550 Processor Module from Rockwell Automation is an early-generation high-reliability controller designed for industrial automation systems requiring stable logic execution and flexible I/O integration.
Although it belongs to an earlier ControlLogix family, it still plays an important role in legacy systems where long-term operational continuity and system compatibility are critical. It is widely used in retrofit projects, brownfield upgrades, and maintenance of installed industrial bases.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-L1M2 |
| Product Type | ControlLogix 5550 Processor Module |
| User Memory | 1 MB |
| Non-volatile Memory | Not supported |
| Backplane Current (5V DC) | ~1.05 A |
| Backplane Current (24V DC) | ~0.02 A |
| Power Dissipation | ~4.8 W |
| Isolation Voltage | 30 V continuous |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Programming Cable | 1756-CP3 / 1747-CP3 |
| Battery | 1756-BA1 lithium battery |
| Dimensions (H × W × D) | 13.3 × 5.1 × 14.5 cm |
| Weight | ~0.37 kg |
This module is designed with an open-style enclosure and fits into standard ControlLogix chassis systems, making it suitable for industrial retrofit environments.
Recommended Related Models
For system maintenance or expansion, the following components are commonly paired with the 1756-L1M2:
- 1756-L55 ControlLogix Processor (higher generation upgrade path)
- 1756-ENBT Ethernet Communication Module
- 1756-DHRIO Remote I/O Interface Module
- 1756-IB16 Digital Input Module
- 1756-OB16 Digital Output Module
Popular Allen-Bradley ControlLogix Models
Within the same ecosystem, engineers often work with:
- 1756-L1 / L1M1 legacy controllers
- 1756-L55 Series processors
- 1756-L71 / L72 modern ControlLogix CPUs
- 1756-EN2T EtherNet/IP communication modules
- 1756-CNB ControlNet Bridge modules
These modules represent the evolution path from legacy control systems to modern high-speed industrial automation architectures.
