Overview
The Allen-Bradley 1756-L55 is a Series A ControlLogix Logix 5555 processor module designed as a core component of Rockwell Automation’s modular control platform. The 1756-L55 is a ControlLogix Logix5555 processor module designed for high-performance industrial automation applications, featuring a 100 MHz processor and supporting up to 128 discrete and 128 analog I/O points. The module does not include internal user memory but is compatible with external memory modules for flexible data handling and offers integrated communication via Ethernet, ControlNet, and DeviceNet, making it suitable for complex manufacturing environments. The 1756-L55 processor module comes without any user memory but it includes a 1756-BA1 battery.
Key Features
- 100 MHz processor with support for up to 128 discrete and 128 analog I/O points
- Compatible with wide range of I/O modules, communication adapters, and chassis configurations via standard ControlLogix backplane communication
- RS-232 communication port with basic insulation type and 30 Volts continuous isolation voltage
- Meets IEC 60068 ratings in regard to temperature, humidity, vibration, and shock tolerance
- Compatible with external memory modules for flexible data handling
- Battery included (1756-BA1); external memory modules like the 1756-M13 expand program capacity
Technical Specifications
- Backplane Power: 1.23 to 1.25 Amps at 5.1 Volts DC and 0.014 Amps at 24 Volts DC
- Power Dissipation: 5.6 to 5.7 Watts with thermal dissipation of 19.1 to 19.4 BTU per hour
- Processor Speed: 100 MHz
- Operating Temperature: 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)
- Storage Temperature: -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit)
- Weight: 0.35 kilograms (12.5 ounces)
- Enclosure Type: Open-style enclosure for installation in protected control cabinet environments
- Communications: RS-232, Ethernet, ControlNet, DeviceNet
- User Memory: None (compatible with external memory expansion modules)
- Isolation Voltage: 30 Volts continuous
- IEC Temperature Code: T4; Uses 1756-CP3 or 1747-CP3 serial cable
Typical Applications
The Allen-Bradley 1756-L55 ControlLogix Logix 5555 Processor is a high-performance controller designed to be a core component of Rockwell Automation’s ControlLogix platform, offering scalable control for industrial automation systems, delivering reliability and efficiency in managing complex operations. Ideal for manufacturing systems, process control, motion control integration, and multi-network environments requiring robust performance and rapid processing capabilities.
Compatibility & Replacements
Compatible With
- 1756 ControlLogix chassis (series A)
- 1756 I/O modules (discrete, analog, specialty)
- 1756 communication adapters (EtherNet/IP, ControlNet, DeviceNet)
- Studio 5000 Logix Designer software
- Allen-Bradley RSLinx communication platform
- External memory modules (1756-M13, 1756-M24, etc.)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1756-L55 /A is designed as a direct replacement within ControlLogix 1756 systems requiring Logix 5555 processors. Check firmware revision and memory module configuration for your specific application.
Works With
- Studio 5000 Logix Designer
- RSLinx Classic and RSLinx Enterprise
- EtherNet/IP protocol
- ControlNet communication
- DeviceNet networks
- Rockwell Automation FactoryTalk View HMI platforms
