1756-L84EK

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L84EK

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

OPC UA nodes supported max

10,000 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 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

20 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

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• Conformally coated ControlLogix 5580 controller
• 4 GB SD card 1784-SD4 ships pre-installed
• USB 2.0 port for programming and firmware updates
• Programs in ladder, structured text, FBD and SFC
• Chassis-based, one slot wide, any slot

About the Allen-Bradley 1756-L84EK

The Allen-Bradley 1756-L84EK is a ControlLogix 5580 Controller, described by Rockwell Automation as having 20 MB user memory, a USB port, a 1GB Ethernet port, 150 EtherNet/IP devices and a 4 character alpha/numeric display, and it is conformally coated. Rockwell technical data 1756-TD001 lists 128,000 digital I/O maximum, 4000 analog I/O maximum and 32 controller tasks. It also lists a current draw of 1.20 A at 5.1V DC, power dissipation of 6.2 W and an approximate weight of 0.394 kg. Rockwell names the 1756-L84EXT (Direct Replacement) as its replacement.

What is the 1756-L84EK used for?

It is a chassis-based controller that takes one slot, in any slot of the 1756 chassis listed by Rockwell. Rockwell lists communication options including EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS. It supports integrated motion on the EtherNet/IP network and programming in relay ladder logic, structured text, function block diagram and sequential function chart.

Lifecycle and successor

Phased out.

OEM successor: 1756-L84EXT

Before you order

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

Check that the catalog number on the label reads 1756-L84EK, and note the series letter and firmware revision printed there. Send us a photo of the label if you want us to confirm these details before you order.