1756-L81EPXT

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L81EPXT

Type

ControlLogix process 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, and third-party process and device networks

EtherNet/IP nodes supported, max

100 nodes

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 variant rated for harsh environments) 256 EtherNet/IP; 128 TCP (1756-EN2x variant rated for harsh environments) 128 EtherNet/IP; 64 TCP (1756-ENBT variant rated for harsh environments) 100 ControlNet (1756-CN2/A variant rated for harsh environments) 40 ControlNet (1756-CNB/D, 1756-CNB/E variant rated for harsh environments) 128 ControlNet (1756-CN2/B variant rated for harsh environments)

Integrated motion

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

Controller redundancy

Full support with Studio 5000 Logix Designer application version 33.00.00 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-SD4XT), 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

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• Embedded Ethernet port at 10/100/1000 Mbps
• USB 2.0 port for programming and firmware update
• Supports 32 tasks with 1000 programs per task
• 4 GB SD card ships pre-installed in the controller
• Programs in ladder, structured text, function block and SFC

About the Allen-Bradley 1756-L81EPXT

The Allen-Bradley 1756-L81EPXT is a ControlLogix 5580 Process XT Controller, which Rockwell lists with an Active lifecycle status. Rockwell technical data 1756-TD001 gives 3 MB standard memory, a maximum of 128,000 digital I/O and a maximum of 4000 analog I/O. It is a chassis-based module, one slot wide, that fits any slot in a 1756-A7XT, 1756-A10XT, Series C 1756-A7ZXT or 1756-A10ZXT chassis. Rockwell gives power dissipation as 6.2 W, weight as approximately 0.394 kg and enclosure type rating as none (open-style).

What is the 1756-L81EPXT used for?

Rockwell lists the controller as supporting EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SERCOS and third-party process and device networks, with up to 100 EtherNet/IP nodes. Integrated motion is available through the SERCOS interface, analog options (encoder input, LDT input, SSI input) and Integrated Motion on the EtherNet/IP network. Controller redundancy is fully supported with Studio 5000 Logix Designer application version 33.00.00 or later.

Lifecycle and successor

Active.

Before you order

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

Check the catalog number 1756-L81EPXT, the series letter and the firmware revision on the label before ordering. Send us a photo of the label so we can confirm the part.