1756-L81EK

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L81EK

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 1000 programs/task

Built-in communication ports

1-port USB, Embedded Ethernet port

USB port communication

USB 2.0, Full speed (12 Mbps), Programming, configuration, firmware update, and online edits only

Ethernet performance

10/100/1000 Mbps

I/O Capacity (Class 0/1)

128,000 without CIP Security™ 40,000 with integrity 20,000 with integrity and confidentiality

Communication options

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

Network connections per network

ControlLogix 5580 Controllers front EtherNet/IP port. See ‘EtherNet/IP nodes supported, max’ in this table. 1000 I/O; 528 EtherNet/IP; 512 TCP (1756-EN4TR or variant rated for harsh environments) 256 EtherNet/IP; 128 TCP (1756-EN2x or variant rated for harsh environments) 128 EtherNet/IP; 64 TCP (1756-ENBT or variant rated for harsh environments) 100 ControlNet (1756-CN2/A or variant rated for harsh environments) 40 ControlNet (1756-CNB/D, 1756-CNB/E or variant rated for harsh environments) 128 ControlNet (1756-CN2/B or variant rated for harsh environments)

Integrated motion

SERCOS interface beginning with Studio 5000 Logix Designer® application version 31.00.01 or later, Analog options (encoder input, LDT input, SSI input) beginning with Studio 5000 Logix Designer application version 31.00.01 or later, Integrated Motion on the EtherNet/IP network

Controller redundancy

Full support with Studio 5000 Logix Designer application version 33.00.02 or later

Programming languages

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

Standard memory

3 MB

Digital I/O max

128,000

Analog I/O max

4000

Nonvolatile memory storage

4 GB Secure Digital (SD) card (1784-SD4), ships pre-installed in the controller

Energy storage module

Embedded in controller, non-removable

Number of power cycles

80,000

Current draw @ 1.2V DC

5.0 mA

Current draw @ 5.1V DC

1.20 A

Power dissipation

6.2 W

Thermal dissipation

21.2 BTU/hr

Isolation voltage

50V (continuous), Basic Insulation type, USB port to backplane, Ethernet port to backplane, and USB port to Ethernet port, Compliant and tested according to IEC/UL 61010-1

Weight approx

0.394 kg (.868 lb)

Slot width

1

Module location

Chassis-based, any slot

Chassis

1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K, 1756-A17, 1756-A17 K Series B, Series C

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• 32 tasks with up to 1000 programs per task
• Ladder logic, structured text, function block and SFC programming
• 4 GB SD card ships pre-installed in the controller
• Chassis-based, one slot wide, fits any slot
• Controller redundancy with Logix Designer version 33.00.02 or later

About the Allen-Bradley 1756-L81EK

The Allen-Bradley 1756-L81EK is a ControlLogix 5580 Controller, according to Rockwell Automation, with 3 MB user memory, a USB port, a 1GB Ethernet port and a conformally coated finish. Rockwell's technical data 1756-TD001 lists 32 tasks, 128,000 digital I/O maximum and 4000 analog I/O maximum. It also lists a 4 GB SD card (1784-SD4) pre-installed in the controller and an embedded, non-removable energy storage module. Rockwell names the 1756-L81EXT as a Direct Replacement.

What is the 1756-L81EK used for?

The controller runs the control program in a chassis-based ControlLogix system and can be fitted in any slot of the listed 1756 chassis. Programs can be written in relay ladder logic, structured text, function block diagram or sequential function chart. Rockwell lists communication options including EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS, with integrated motion on the EtherNet/IP network.

Lifecycle and successor

Phased out.

OEM successor: 1756-L81EXT

Before you order

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

Check the catalog number 1756-L81EK, the series letter and the firmware revision on the module label before ordering or fitting. Send a photo of the label if you need the match confirmed.