Product Overview
In demanding industrial environments, reliable control is non-negotiable. The Allen-Bradley 1756-L55 ControlLogix Logix5555 processor delivers the performance you need. This processor module, part of the ControlLogix family (Series A), is designed for robust automation applications. It comes without user memory, making it a flexible choice for systems that rely on external memory or specific application requirements.
As a high-quality component from Allen-Bradley/Rockwell Automation, the 1756-L55 ensures top-level performance and compliance with North American and European industrial standards. It meets various IEC 60068 ratings for temperature, humidity, vibration, and shock tolerance.
Technical Specifications
The 1756-L55 offers precise electrical and environmental characteristics. Here are the key parameters:
| Specification |
Value |
| Brand |
Allen-Bradley / Rockwell Automation |
| Series |
ControlLogix |
| Part Number |
1756-L55 |
| User Memory |
None |
| Backplane Current at 5.1 VDC |
1.23 to 1.25 Amps |
| Backplane Current at 24 VDC |
0.014 Amps |
| Power Dissipation |
5.6 to 5.7 Watts |
| Thermal Dissipation |
19.1 to 19.4 BTU/hr |
| Isolation Voltage |
30 Volts (continuous) |
| Enclosure Type |
None (Open-style) |
| Battery |
Included (1756-BA1) |
| Operating Temperature |
0 to 60 °C (32 to 140 °F) |
| Storage Temperature |
-40 to 85 °C (-40 to 185 °F) |
| Weight |
0.35 kg (12.5 oz) |
| UPC |
10612598269638 |
These specifications ensure reliable operation in typical industrial settings. The low backplane current reduces power supply load, while the wide temperature range allows installation in various environments.
Industry Applications
The Allen-Bradley 1756-L55 processor is commonly used in manufacturing, process control, and material handling systems. Its no-memory configuration suits applications where the control program resides on a memory card or is downloaded from a host system.
-
Discrete Manufacturing: Use the 1756-L55 to sequence assembly lines and robotic cells, leveraging its fast backplane communication.
-
Process Control: In continuous processes, the processor handles logic and coordination tasks, ensuring consistent operation.
-
Upgrade Projects: Replace older controllers with the 1756-L55 to modernize your ControlLogix infrastructure without changing the form factor.
Installation & Setup
Installing the 1756-L55 is straightforward. The module mounts directly into a ControlLogix chassis. Ensure proper seating and secure the locking mechanism. Connect the backplane via the provided connectors. For serial communication, use the 1756-CP3 or 1747-CP3 cable. Verify that the chassis power supply meets the backplane current requirements (1.23-1.25 A at 5.1 VDC).
Maintenance & Reliability
Regular inspection of the 1756-L55 ensures long service life. Check the battery (1756-BA1) periodically to maintain memory retention. Keep the module free of dust and debris, as the open-style enclosure offers no protection. Operate within the specified temperature range to avoid thermal stress. Following these practices minimizes downtime and extends equipment life.
Compatibility & Integration
The 1756-L55 integrates seamlessly with the ControlLogix 1756 series. It communicates over the chassis backplane and includes an RS-232 communication port for serial connectivity. This processor works with other ControlLogix modules, including I/O, communication, and motion control modules. For serial connections, the module uses the 1756-CP3 or 1747-CP3 cable.
Buying Guide
Before purchasing a 1756-L55, verify your system requirements: confirm the chassis type, power supply capacity, and memory needs. Ensure you have the necessary serial cables and battery. PLC Source PRO offers genuine Allen-Bradley 1756-L55 modules with fast shipping and reliable support. Choose PLC Source PRO for your automation spares.