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A-B 1756-L71 Product Details

Sep 04, 2025 Allen‑Bradley

A-B 1756-L71 is a processor module in Rockwell Automation’s ControlLogix 5570 series controller.The following is a detailed introduction to it.

A-B 1756-L71

Product Overview

Brand and Model:Allen-Bradley(Rockwell Automation)1756-L71

Type:Programmable Automation Controller(PAC),which combines the reliability of a programmable logic controller(PLC)with the powerful functions of an industrial computer.

Main Features and Functions

High-performance processor

Equipped with a high-performance processor,it can quickly execute complex control algorithms and data processing tasks to ensure that the system responds quickly and accurately.

Rich I/O Interface

Provides a variety of input/output(I/O)interfaces and supports a variety of signal types,including digital signals,analog signals,etc.

Can easily connect various sensors,actuators and external devices to achieve comprehensive data acquisition and control.

Powerful programming and configuration capabilities

Supports multiple programming languages,such as ladder diagrams,function block diagrams,structured text,etc.,to facilitate users to program and configure according to actual needs.

It provides an intuitive user interface and powerful debugging tools,making the programming and debugging process more convenient and efficient.

Network communication function

Built-in network communication module,supporting multiple communication protocols,such as Ethernet,Modbus,ControlNet,DeviceNet,etc.

It can exchange and communicate real-time data with other devices,host computers or remote terminals to realize distributed control systems and remote monitoring functions.

High reliability and stability

It adopts industrial-grade design and manufacturing standards,with excellent anti-interference ability and stability.

It can operate stably for a long time in harsh industrial environments to ensure the continuity and reliability of the production process.

Scalability and flexibility

It supports modular design,and users can add or remove functional modules according to actual needs to meet control requirements of different scales and complexities.

It provides a wealth of options and accessories to further enhance its flexibility and adaptability.

A-B 1756-L71

Main performance parameters

Processor type:high-performance processor,supporting complex control logic.

User memory:2MB,used to store user programs and data.

I/O memory:0.98MB,used to process input and output signals.

Memory card:Equipped with 1784-SD1 secure digital(SD)memory card with a capacity of 1GB non-volatile memory,which can be upgraded to 2GB by replacing the 1784-SD2 card.

Discrete input/output signals:Up to 128,000 discrete input and output signals can be processed.

Analog input/output signals:4000 analog input and output signals can be processed.

Communication protocol:Supports multiple communication protocols such as Ethernet/IP,control network,device network,data highway Plus,remote I/O,SynchLink,and third-party process and device networks.

Network interface:With the second Ethernet/PROFINET interface(X5)and the third IF 964-DP interface(pluggable).

Structure:Modular.

Installation method:Control room installation.

Working voltage:24V.

Output frequency:50~60Hz.

Processing speed:300μs.

Ambient temperature:It is recommended to work in the range of 0~55℃,up to 50℃(pay attention to heat dissipation and ventilation).

Ambient humidity:Relative humidity should be less than 85%(no condensation).

Application field

A-B 1756-L71 programmable automation controller is widely used in industrial automation and control systems,such as manufacturing,energy,transportation,water treatment,etc.It can help users achieve efficient and precise control tasks,improve production efficiency and product quality.Whether it is for new projects or for upgrading and renovating existing systems,A-B 1756-L71 is an excellent choice worth considering.

In summary,A-B 1756-L71 is a powerful,stable and easy-to-use programmable automation controller.

Allen-Bradley 1756-L71 ControlLogix Processor Module
Allen-Bradley
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Allen-Bradley 1756-L71

Nov 26, 2025

Overview Allen Bradley 1756-L71 is a ControlLogix processor module, specifically a Logix5571 processor with 2 MB of user memory. It belongs to Rockwell Automation’s extensive line of programmable logic controllers (PLCs) for industrial au

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