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Includes a PDF Electric and Supply warranty.

(Never Used)


4 In Stock

3 Yr PDF Supply warranty

What is Surplus?



1 In Stock

2 Yr PDF Supply Warranty

What is Refurbished?

Repair Service


5-10 Days

2 Yr PDF Supply warranty


Other Available Revisions for the 1756-L71 1756-L71/A1756-L71/B

Common misspellings:
  • l756-L71
  • 1756-171
  • 1756-L7l
  • 1756L71

Technical Specifications for 1756-L71

ManufacturerAllen-Bradley / Rockwell Automation
Part Number1756-L71
Product TypeController Module
Controller Tasks32 Tasks and 1000 Programs/Task, Maximum
Communication Ports1 USB, 2.0 Full-Speed, Type B Port
Serial Port CommunicationN/A
Controller Connections Supported500
Controller RedundancyFull Support Except for Motion Applications
SoftwareStudio 5000 Environment and RSLogix 5000 Software

The Allen-Bradley 1756-L71 ControlLogix controller belongs to Series A of the programmable automation controllers. Manufactured by Allen-Bradley/Rockwell Automation, this controller comes with 2 MB of user storage memory and 0.98 MB of I/O memory. It features an onboard 4-character alphanumeric display to enable easy monitoring of the run-time information as well as the controller diagnostics. The 1756-L71 features an open enclosure type and one USB port with full speed.The 1756-L71 controller supports controller redundancy if it is paired up with a similar controller in the same ControlNet network. The controller has USB port communication which allows for programming, configuration, firmware flashl and on-line edits only. The communication choices that are available are the ControlNet, DeviceNet, Remote I/O Data Highway Plus, EtherNet/IP, 3rd party process, and SynchLink networks.

The 1756-L71 controller is installed in ControlLogix chassis such as the 1756-A10K, 1756-A4K, 1756-A4, 1756-A7K, 1756-A7, 1756-A17, 1756-A10, 1756-A13, 1756-A17K, and the 1756-A13K chassis. The Allen-Bradley 1756-L71 ControlLogix controller comes with a non-compulsory non-volatile memory, an SD card of 1 GB called the 1784-SD1, and this can be upgraded to 2 GB using the 1784-SD2 SD card. It is essential that the SD card remain installed in the 1756-L71 controller because that is where the diagnostic data is saved, and this is the information that Rockwell Automation uses when troubleshooting an issue with the controller. It is best to use Rockwell Automation SD cards since there are many other SD cards which have not been tested for compatibility with the controller. In fact, the use of other SD cards may result in data corruption. The Allen-Bradley 1756-L71 controller ships with 3 different capacitor modules for energy storage, 2 are removable and the non-removable 1756-ESMNRM/1756-ESMNRMK module is used to secure the controller through the prevention of USB connections.

The 1756-L71 controller is a controller that has been included in the ControlLogix series and that has been designed to be exclusively used in a ControlLogix control system. This part, along with the whole ControlLogix series, has been manufactured by Allen-Bradley. The ControlLogix control systems consist of a common control engine that can provide high performance in a standard industrial environment. This system is widely known for its versatility when it comes to communication options and mounting alternatives. The Allen-Bradley 1756-L71 controller comes with a clock that is supported by an energy storage module that enables it to save and recover data in case of a power failure. There is specific software that is made for use with this controller and it includes the Studio 5000 software that is version 21.00.00 or later and the RSLogix 5000 software that is version 19.01.00 or later.

The Allen-Bradley 1756-L71 controller uses the version 20 or later of the firmware revision to operate. This controller can perform up to 32 tasks and up to 1000 programs per task at a time. It also has the option to perform event tasks and it communicates with different devices through a USB port. This port is a 2.0 full-speed Type B connector. The Allen-Bradley 1756-L71 controller does not include a serial port communication module. However, it supports up to 500 controller connections at a time and it provides full application support except when it is used in motion applications that are not compatible with the controller. This controller can be programmed through different programming languages for different applications. 

The Allen-Bradley 1756-L71 controller can be used with the RSLogix 5000 software and it has been designed to operate with multiple tasks (up to 32 at a time). It is part of the CompactLogix series.

F.A.Q for 1756-L71

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