Allen-Bradley 1756-L1M1 ControlLogix Processor

Product Introduction

The 1756-L1M1 is a capable processor module within the ControlLogix platform. This Logix5550 controller delivers 500 KB of user memory for logic and data storage. Additionally, it offers 150 KB of dedicated I/O memory. This combination supports medium-scale automation applications effectively. The module weighs just 0.35 kilograms, making it easy to handle and install. It occupies a single slot in the 1756 chassis. Furthermore, this processor supports extensive I/O capabilities for diverse control tasks.

Key Technical Specifications

This processor draws a backplane current of 120 mA at 5V DC. Meanwhile, it consumes only 2 mA at 24V DC. The maximum power dissipation reaches 4.1 W at 60 °C. Its average thermal dissipation is rated at 15.6 BTU/hour. The isolation voltage is 30V continuous with basic insulation. Additionally, the module has been tested to withstand 500V for 60 seconds. The 1756-L1M1 includes a replaceable battery. Specifically, it is compatible with the 1756-BA1 lithium battery only. For programming, you need the 1756-CP3 serial cable, which is a category 3 cable.

Memory and Storage Options

The 1756-L1M1 does not include built-in nonvolatile memory. Therefore, you must rely on the battery-backed RAM to retain programs during power loss. The onboard 1756-BA1 battery maintains memory content effectively. Regular battery checks are recommended for uninterrupted operation. Unlike other models, this processor does not support external memory modules. Consequently, program storage is limited to the internal RAM.

Communication Capabilities

This controller supports a broad range of communication networks. For instance, it works with DeviceNet, ControlNet, and DH+ networks. Additionally, it communicates via EtherNet/IP and RS-232-C protocols. The integrated serial port connects to programming devices seamlessly. Furthermore, it interfaces with HMIs, SCADA systems, and other visualization platforms. The 1756-L1M1 also supports distributed I/O configurations. Specifically, it works with ControlLogix I/O, Flex I/O, and POINT I/O modules. Communication setup is defined through RSLinx software.

Electrical Immunity and Robustness

The 1756-L1M1 offers excellent electrical immunity for harsh environments. It features ESD contact discharge immunity of 6 kV. Additionally, it provides ESD air discharge immunity of 8 kV. The radiated RF immunity is 10V/m with 1 kHz sine-wave 80% AM from 30 MHz to 1000 MHz. It also handles EFT/B immunity of +/-4 kV at 2.5 kHz on power ports. For communication ports, the rating is +/-2 kV at 5 Hz. The conducted RF immunity is 10V rms with 1 kHz sine-wave 80% AM from 150 kHz to 80 MHz. These features make it highly dependable for industrial applications.

Mechanical and Environmental Ratings

The operating temperature ranges from 0 °C to 60 °C. In contrast, the storage temperature spans -40 °C to 85 °C. The relative humidity must stay between 5% and 95%, non-condensing. This module withstands vibration of 2G at 10 to 500 Hz. Moreover, it handles an operating shock of 30G peak for 11 milliseconds. The non-operating shock rating is 50G peak for 11 milliseconds. The 1756-L1M1 is an open-style module. As such, it does not carry a specific enclosure type rating.

Installation Guidelines

First, insert the module into any available slot in the 1756 chassis. You can install multiple controllers in the same chassis. These controllers communicate across the backplane while operating independently. The 1756-L1M1 occupies just one slot in the chassis. Power is supplied through the backplane from a ControlLogix power supply. Compatible chassis include the 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17. Always follow standard ESD precautions during handling and installation. The module is compatible with removable terminal blocks such as the 1756-TBCH and 1756-TBS6H.

Programming and Diagnostics

This controller supports IEC 61131-3 programming languages. For example, it works with Ladder Logic, Function Block Diagram, and Sequential Function Chart. Additionally, it supports Statement List programming. The front panel features diagnostic LED indicators. These lights report the module's operating status clearly. Consequently, troubleshooting becomes faster and more efficient.

Packaging List

• One Allen-Bradley 1756-L1M1 Logix5550 Processor module

• Factory-installed battery (1756-BA1 type)

• Product information leaflet

Shipping Information

All orders are dispatched via FedEx, UPS, or DHL. Express shipping is available for international destinations. Tracking details are provided after dispatch.

Frequently Asked Questions (FAQ)

1. What is the memory capacity of the 1756-L1M1?
The 1756-L1M1 provides 500 KB of data and logic memory. Additionally, it includes 150 KB of dedicated I/O memory for handling input and output operations.

2. Does this processor support external memory modules?
No, the 1756-L1M1 does not support external memory modules. Program storage relies on the internal battery-backed RAM only.

3. What battery type is compatible with this module?
This processor works exclusively with the 1756-BA1 lithium battery. Do not use any other battery type, as it may cause malfunction.

4. Which programming cable do I need for the 1756-L1M1?
You must use the 1756-CP3 serial cable, which is a category 3 cable. This is the only compatible programming cable for this module.

5. What is the maximum I/O capacity of this controller?
The 1756-L1M1 supports extensive I/O configurations. It works with ControlLogix I/O, Flex I/O, and POINT I/O modules for flexible system design.