Allen-Bradley ControlLogix 1756-L55 PLC Controller

Product Overview

The Allen-Bradley 1756-L55 is a controller from the ControlLogix series. It offers a compact design for industrial automation. This module uses an RS-232 communication port. It connects via a 1756-CP3 or 1747-CP3 serial cable. The unit has low power dissipation at 5.6 to 5.7 Watts. It is an open-style enclosure for easy integration.

This controller draws 1.23 to 1.25 Amps from the 5.1 Volt backplane. It draws only 0.014 Amps at 24 Volts DC. The thermal dissipation is 19.1 to 19.4 BTU per hour. This makes it efficient for control cabinets. The 1756-L55 includes a 1756-BA1 battery. This battery preserves memory during power loss.

Application Scenarios

Use this controller in discrete manufacturing. It works well in process control systems. The module fits in ControlLogix chassis. It is ideal for medium to large applications. The RS-232 port allows simple programming. Engineers use it for machine control and data collection. The open-style design suits clean environments. It operates from 0 to 60 degrees Celsius.

This unit is common in automotive and packaging lines. It also works in material handling systems. The low power dissipation reduces heat buildup. This improves system reliability over time. The 1756-L55 supports standard ControlLogix features. It is a cost-effective choice for many plants.

Technical Specifications

User memory is not included. Backplane current at 5.1 Volts DC is 1.23 to 1.25 Amps. Backplane current at 24 Volts DC is 0.014 Amps. Power dissipation is 5.6 to 5.7 Watts. Thermal dissipation is 19.1 to 19.4 BTU per hour. Isolation voltage is 30 Volts continuous. Enclosure type is open-style. Battery is a 1756-BA1 included. Operating temperature is 0 to 60 degrees Celsius. Storage temperature is -40 to 85 degrees Celsius. Weight is 0.35 kilograms. UPC is 10612598269638. Communication port is RS-232. Serial cable is 1756-CP3 or 1747-CP3. IEC temperature code is T4.

Installation & Maintenance Guide

Install the module into a ControlLogix chassis. Ensure power is off before insertion. Connect the RS-232 cable to the port. Use only 1756-CP3 or 1747-CP3 cables. Secure the module with screws. Check the battery status regularly. Replace the battery every few years. Keep the area clean and dry. Do not exceed 60 degrees Celsius. Use proper grounding techniques.

Maintain the module by inspecting connections. Clean with a dry cloth only. Avoid liquids near the unit. Store at -40 to 85 degrees Celsius. Use original packaging for transport. Always follow the user manual for details. The 1756-L55 is easy to replace if needed.

Packing List

One Allen-Bradley 1756-L55 controller. One 1756-BA1 battery. No cables are included. Order cables separately if needed. The product is shipped in a protective box. We ship via FedEx, UPS, or DHL. Contact us for faster options.