1756-L72S

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L72S

Type

GuardLogix safety controller

Application

PLC controller

Used with

ControlLogix 1756 chassis

Safety communication options

Standard and safety, EtherNet/IP, ControlNet, DeviceNet

Network connections per network module

1000 I/O; 528 EtherNet/IP; 512 TCP (1756-EN4TR) 256 EtherNet/IP; 128 TCP (1756-EN2x) 128 EtherNet/IP; 64 TCP (1756-ENBT) 128 ControlNet (1756-CN2/B) 100 ControlNet (1756-CN2/A) 40 ControlNet (1756-CNB/D, 1756-CNB/E)

Programming languages

For the safety task, GuardLogix controllers support Ladder Diagram only., For standard tasks, GuardLogix controllers support: – Ladder Diagram (LD) – Structured Text (ST) – Function Block Diagram (FBD) – Sequential Function Chart (SFC)

User memory

4 MB

Safety memory

2 MB

I/O memory

0.98 MB

Nonvolatile memory storage

1 GB Secure Digital (SD) card (1784-SD1), ships pre-installed in the controller

Digital I/O, max

128,000

Analog I/O, max

4000

Total I/O, max

128,000

Energy storage modules

1756-ESMCAP capacitor energy storage module (removable, ships installed with every controller) 1756-ESMNSE capacitor energy storage module (removable, no residual, WallClockTime power backup) 1756-ESMNRM capacitor energy storage module (non-removable, helps prevent USB connection and SD card use to help secure the controller)

Current draw @ 1.2V DC

5 mA

Current draw @ 5.1V DC

800 mA

Power dissipation

2.5 W

Thermal dissipation

8.5 BTU/hr

Isolation voltage

30V (continuous), basic insulation, USB port-to-system, Compliant and tested according to IEC/UL 61010-1

Weight, approx

0.25 kg (0.55 lb)

Slot width

2 (both modules needed; each is one slot)

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

Power supply, standard

1756-PA50, 1756-PA50K, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB50K 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PC75, 1756-PH75

Power supply, redundant

1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K

Wire category

3 - on USB ports

Temperature code

T4

Enclosure type rating

None (open-style)

Technical documents (1)

• Rockwell Automation technical data 1756-TD001

Key features

• 4 MB user memory and 2 MB safety memory
• 1 GB SD card ships pre-installed for nonvolatile storage
• Up to 128,000 total I/O
• Chassis-based, any slot, two modules of one slot each
• Operating temperature 0 °C to +60 °C, open-style

About the Allen-Bradley 1756-L72S

The Allen-Bradley 1756-L72S is a Logix 5572S Automation Controller 4M/2M, listed by Rockwell Automation with the lifecycle status Active Mature. According to Rockwell technical data 1756-TD001, it has 4 MB user memory, 2 MB safety memory and 0.98 MB I/O memory. It supports up to 128,000 total I/O, of which up to 4000 can be analog, and ships with a pre-installed 1 GB SD card (1784-SD1). Rockwell gives its power dissipation as 2.5 W and its current draw as 800 mA at 5.1V DC.

What is the 1756-L72S used for?

Rockwell lists this GuardLogix controller for standard and safety control over EtherNet/IP, ControlNet and DeviceNet. For the safety task it supports Ladder Diagram only, while standard tasks can use Ladder Diagram, Structured Text, Function Block Diagram and Sequential Function Chart. It is chassis-based and fits any slot, and Rockwell states that both modules are needed, each taking one slot.

Lifecycle and successor

Active.

Before you order

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

Check that the catalog number on the module label reads 1756-L72S, and note the series letter and firmware revision printed on the same label. Send us a photo of the label if you want us to confirm the part before you order.