1756-L81ESK

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L81ESK

Type

GuardLogix safety controller

Application

PLC controller

Used with

ControlLogix 1756 chassis

Controller tasks

31 standard tasks, 1 safety task 1000 programs/task, Ethernet port

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

Standard memory

3 MB

Safety memory

1.5 MB

Digital I/O, max

128,000

Analog I/O, max

4000

Nonvolatile memory storage

4 GB Secure Digital 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, Ethernet to backplane, USB to backplane, and USB to Ethernet, 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 and Series C

Wire category

3 - on USB port 2 - on Ethernet ports

Wire size

Ethernet connections:, Ethernet cabling and installation according to IEC 61918 and IEC 61784-5-2

Temperature code

T4

Enclosure type rating

None (open-style)

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• 31 standard tasks and 1 safety task
• USB 2.0 port for programming and firmware update
• 4 GB SD card (1784-SD4) pre-installed
• Chassis-based, any slot, one slot wide
• Operates 0 to 60 °C in Series C chassis

About the Allen-Bradley 1756-L81ESK

The Allen-Bradley 1756-L81ESK is a GuardLogix 5580 safety controller, listed by Rockwell Automation with 3 MB of standard memory and 1.5 MB of safety memory. Rockwell describes it as conformal coated, with a USB port, a 1 Gb embedded Ethernet port and support for 100 EtherNet/IP devices. Rockwell technical data 1756-TD001 gives 31 standard tasks and 1 safety task, a pre-installed 4 GB SD card (1784-SD4) and a current draw of 1.20 A at 5.1V DC. Power dissipation is 6.2 W and the module is one slot wide.

What is the 1756-L81ESK used for?

It is a chassis-based controller that fits any slot in the listed 1756 chassis, including Series B and Series C. It runs standard and safety tasks and communicates over its embedded Ethernet port, while the USB port is used for programming, configuration, firmware update and online edits. Rockwell gives a SIL 2/PLd operating temperature of 0 to 60 °C in a Series C chassis and 0 to 50 °C in a Series B chassis.

Lifecycle and successor

Phased out.

Before you order

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

Check that the label shows catalog number 1756-L81ESK, and note the series letter and firmware revision printed on it. Send us a photo of the label if you want us to confirm the match before you order.