1756-L81EP

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L81EP

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) - 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, Third-party process and device networks

EtherNet/IP nodes supported, max

100 nodes

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-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-A17K Series B, Series C 1756-A7XT, 1756-A10XT Series C 1756-A7ZXT, 1756-A10ZXT

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• Programs in Relay Ladder Logic, Structured Text, Function Block Diagram and SFC
• 4 GB SD card pre-installed for nonvolatile storage
• 32 tasks with up to 1000 programs per task
• Integrated motion over SERCOS and EtherNet/IP
• Redundancy supported from Studio 5000 Logix Designer 33.00.00

About the Allen-Bradley 1756-L81EP

The Allen-Bradley 1756-L81EP is a ControlLogix 5580 Process Controller, described by Rockwell Automation as a 5580E controller with 3 MB user memory, a USB port, a 1 gigabit Ethernet port and a 4 character alpha/numeric display. Rockwell lists maximums of 128,000 digital I/O and 4000 analog I/O, with 100 EtherNet/IP nodes supported. The USB 2.0 port runs at full speed (12 Mbps) and is for programming, configuration, firmware update and online edits only. Rockwell names the 1756-L81EPXT (Direct Replacement) as its replacement.

What is the 1756-L81EP used for?

The 1756-L81EP is a chassis-based controller that fits any slot and is one slot wide. Rockwell lists communication options including EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS. It also supports integrated motion over a SERCOS interface and over the EtherNet/IP network.

Lifecycle and successor

Phased out.

OEM successor: 1756-L81EPXT

Before you order

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

Check that the catalog number on the label reads 1756-L81EP, and note the series letter and firmware revision printed beside it. Send us a photo of the label if you want us to confirm the part before you order.