1756-L72

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L72

Type

ControlLogix controller

Application

PLC controller

Used with

ControlLogix 1756 chassis

Controller tasks

32 tasks, including a combination of one continuous, periodic, and event tasks 32 programs/tasks prior to RSLogix 5000® programming software, version 15.01.00 100 programs/task beginning with RSLogix 5000 programming software, version 15.01.00 1000 programs/task beginning with Logix Designer application, version 24.00.00

Built-in communication ports

1-port USB

Communication options

EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SERCOS, Third-party process and device networks

USB port communication

Programming, configuration, firmware update, and online edits only

Controller connections supported max

500

Network connections, per network module

1000 I/O; 528 EtherNet/IP; 512 TCP (1756-EN4TR) 256 EtherNet/IP; 128 TCP (1756-EN2x) 128 EtherNet/IP; 64 TCP (1756-ENBT) 100 ControlNet (1756-CN2/A) 40 ControlNet (1756-CNB/D, 1756-CNB/E) 128 ControlNet (1756-CN2/B)

Controller redundancy

Full support

Integrated motion

SERCOS interface, Analog options (encoder input, LDT input, SSI input), Integrated Motion on the EtherNet/IP network

Programming languages

Relay ladder logic, Structured text, Function Block Diagram, Sequential function chart (SFC)

User memory

4 MB

I/O memory

0.98 MB

Nonvolatile memory storage

1 GB Secure Digital (SD) card (1784-SD1), ships pre-installed in the controller

Digital I/O max

128,000

Analog I/O max

4000

Total I/O max

128,000

Energy storage module

1756-ESMCAP, 1756-ESMCAPK capacitor energy storage module (removable, ships installed with every controller) 1756-ESMNSE, 1756-ESMNSEK capacitor energy storage module (removable, no residual WallClockTime power backup) 1756-ESMNRM, 1756-ESMNRMK capacitor energy storage module (non-removable, helps prevent USB connection and SD card use to help secure the controller)

Current draw @ 1.2V DC

5 mA

Current draw @ 5.1V DC

800 mA

Power dissipation

2.5 W

Thermal dissipation

8.5 BTU/hr

Isolation voltage

30V (continuous), basic insulation type, USB port-to-system, Compliant and tested according to IEC/UL 61010-1

USB port

USB 2.0, full speed (12 Mbps)

Weight approx

0.25 kg (0.55 lb)

Slot width

1

Module location

Chassis-based, any slot

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• 4 MB user memory and 0.98 MB I/O memory
• 1-port USB 2.0, full speed (12 Mbps)
• Full controller redundancy support
• Ladder, structured text, function block and SFC programming
• Chassis-based, 1 slot wide, fits any slot

About the Allen-Bradley 1756-L72

The Allen-Bradley 1756-L72 is a ControlLogix 4 MB controller, according to Rockwell Automation technical data 1756-TD001. Rockwell lists 4 MB of user memory, 0.98 MB of I/O memory and a maximum of 500 controller connections. It has a 1-port USB interface and is a single-slot, chassis-based module that can be fitted in any slot. Rockwell lists its lifecycle status as Active Mature.

What is the 1756-L72 used for?

The controller runs the control program in a ControlLogix chassis. Rockwell lists EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS among its communication options, and integrated motion including SERCOS interface and Integrated Motion on the EtherNet/IP network. The USB port is for programming, configuration, firmware update and online edits only.

Lifecycle and successor

Active.

Before you order

What to photograph or confirm so the right unit is quoted.

Check that the catalog number on the module label reads 1756-L72, and note the series letter and firmware revision shown there. Send us a photo of the label so we can confirm the details before you order.