1756-L84EXT

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L84EXT

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) - packets/second

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

250 nodes

OPC UA nodes supported max

10,000 nodes

Network connections per network module

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 33.00.02 or later

Programming languages

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

Standard memory

20 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

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• Conformal coated for operation from -25 °C to +70 °C
• Embedded Ethernet port and USB 2.0 programming port
• 32 tasks with up to 1000 programs per task
• Ladder, structured text, function block and sequential function chart programming
• Controller redundancy with Studio 5000 Logix Designer 33.00.02 or later

About the Allen-Bradley 1756-L84EXT

The Allen-Bradley 1756-L84EXT is a ControlLogix 5580 XT Controller, listed by Rockwell Automation with an Active lifecycle status. Rockwell's technical data 1756-TD001 gives 20 MB of standard memory, up to 128,000 digital I/O and up to 4000 analog I/O. It also lists support for up to 250 EtherNet/IP nodes and up to 10,000 OPC UA nodes. The controller is chassis-based, occupies one slot and can be fitted in any slot.

What is the 1756-L84EXT used for?

The 1756-L84EXT runs the control program in a ControlLogix chassis and communicates with other devices over its embedded Ethernet port. Rockwell lists communication options including EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS. It also supports integrated motion, including SERCOS interface and Integrated Motion on the EtherNet/IP network.

Lifecycle and successor

Active.

Before you order

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

Check the catalog number 1756-L84EXT, the series letter and the firmware revision on the label of your unit. Send us a photo of the label so we can check it against your requirement.