1756-L81EXTS

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L81EXTS

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)

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

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
• 4 GB SD card (1784-SD4) pre-installed
• Conformal coated with T4 temperature code
• Chassis-based, any slot, slot width of 1
• USB 2.0 port and embedded Ethernet port

About the Allen-Bradley 1756-L81EXTS

The Allen-Bradley 1756-L81EXTS is a Guardlogix 5580 XT Controller according to Rockwell Automation. Rockwell lists 3 MB of standard memory, 1.5 MB of safety memory, 31 standard tasks and 1 safety task. Rockwell specifies a 4 GB Secure Digital Card (1784-SD4) that ships pre-installed, and an operating temperature of -25 °C to +70 °C (SIL 2/PLd). Rockwell names 1756-L81ESXT (Direct Replacement) as the replacement.

What is the 1756-L81EXTS used for?

Rockwell lists the controller as a chassis-based module that fits any slot of the 1756-A7XT, 1756-A10XT, Series C 1756-A7ZXT and 1756-A10ZXT chassis. It communicates over an embedded Ethernet port rated 10/100/1000 Mbps. The USB 2.0 port is for programming, configuration, firmware update and online edits only.

Lifecycle and successor

Phased out.

OEM successor: 1756-L81ESXT

Before you order

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

Check the catalog number 1756-L81EXTS, the series letter and the firmware revision on the module label before ordering. Send us a photo of the label if you want us to confirm the details.