PLC Controller Allen-Bradley 1756-L1 ControlLogix 5550

Product Overview

The Allen-Bradley 1756-L1 is a powerful ControlLogix 5550 controller. It provides 64 Kilobytes of user memory. This module supports up to 250 connections. You can install it directly into any chassis slot. Multiple controllers can work in the same chassis. They communicate across the backplane. They also operate independently. The 1756-L1 weighs only 0.28 kilograms. It is an open enclosure type. This controller uses a single RS232 communication port. It works with DeviceNet, ControlNet, and EtherNet/IP networks. It also supports DH+ and RS-232-C (DF1/DH-485) protocols.

Application Scenarios

This controller works well for medium-scale automation tasks. It is ideal for manufacturing lines. It fits into process control systems. It can manage discrete and batch processes. Use it for material handling applications. It works in packaging machinery. It supports remote I/O communication. It connects easily to operator interfaces. It is suitable for pump and valve control. It also works in conveyor systems. The 1756-L1 handles multiple network types. It is a flexible choice for many industries.

Technical Specifications

The module has a user memory of 64 KB. It draws 120 milliamps at 5 Volts backplane current. It draws 2 milliamps at 24 Volts backplane current. Maximum power dissipation is 4.1 Watts at 60 degrees Celsius. Average power dissipation is 3.3 Watts. Average thermal dissipation is 11.3 BTU/hour. Isolation voltage is 30 Volts continuous. Operating temperature ranges from 32 to 140 Fahrenheit. Minimum operating current is 2 milliamps at 10 Volts DC. Maximum operating current is 3.5 milliamps at 30 Volts DC. The peak backplane current is 0.65 Amps at 5 Volts DC. Peak backplane current at 24 Volts DC is 0.02 Amps. The controller uses a 1756-CP3 communication cable. It requires battery backup models 1756-BA1 or 1756-BA2. Compatible memory modules include 1756-M1, 1756-M2, and 1756-M3. The removable terminal blocks are 1756-TBCH and 1756-TBS6H. The controller has a slot width of one.

Installation & Maintenance Guide

Install the 1756-L1 into any available chassis slot. Ensure the chassis is powered off before installation. Align the module with the backplane connector. Press firmly until it locks into place. Connect the communication cable type 1756-CP3. Install the battery backup for memory retention. Use only 1756-BA1 or 1756-BA2 batteries. Replace the battery when the low battery indicator appears. Keep the enclosure open for proper airflow. Do not exceed the maximum operating temperature. Check the backplane current limits regularly. Use the correct removable terminal blocks. Tighten screws to the specified torque. Perform regular diagnostics through the software. Update firmware as needed for best performance.

Packing List

1 x Allen-Bradley 1756-L1 ControlLogix 5550 controller. 1 x 1756-CP3 communication cable. 1 x 1756-BA1 battery backup. 1 x 1756-TBCH removable terminal block. 1 x 1756-TBS6H removable terminal block. 1 x user manual and documentation. The product is packed in an anti-static bag. It is shipped in a sturdy cardboard box. Shipping is available via Fedex, UPS, or DHL.