Product Overview

The Allen-Bradley 1756-L81ES is a GuardLogix 5580 safety controller for ControlLogix systems. This processor has 3 MB of standard user memory. It also has 1.5 MB of dedicated safety memory. Total memory is 4.5 MB. The module includes a 1GB Ethernet port and a USB 2.0 port. It supports up to 128,000 I/O points. A 4-character alpha-numeric display shows module status. The controller works with Studio 5000 software.

For inquiries, contact us at +86 158 8020 0923 (WhatsApp).

Part Number Breakdown (Tree Structure)

• 1756 → Series Family
  • ControlLogix platform
  • Allen-Bradley / Rockwell Automation
• L → Product Type
  • Logix controller (processor)
• 81 → Memory Size
  • 3 MB standard memory
  • 1.5 MB safety memory
• ES → Safety Version
  • GuardLogix safety controller
  • Ethernet and USB communication

Memory Specifications

• Standard User Memory: 3 MB
• Safety Memory: 1.5 MB
• Nonvolatile Memory: 2 GB (integrated)
• Compatible Removable Memory: 1756-SD2 (only)

I/O Capacity

• Maximum Digital I/O: 128,000 points
• Maximum Analog I/O: 4,000 points
• Total Maximum I/O: 128,000 points

Tasks and Programs

• Standard Tasks: 31 tasks
• Safety Tasks: 1 task
• Programs per Task: 1,000 programs
• Total Programs: Up to 32,000 programs

Communication Ports

• Ethernet Port: 1 port at 10/100/1000 Mbps
• USB Port: 1 port at 12 Mbps (USB 2.0)
• Maximum Ethernet/IP Nodes: 100 nodes

Network Connection Capacity

• EtherNet/IP (1756-EN2x): 256 connections
• TCP (1756-EN2x): 128 connections
• EtherNet/IP (1756-ENBT): 128 connections
• TCP (1756-ENBT): 64 connections
• ControlNet (1756-CN2/A): 100 connections
• ControlNet (1756-CN2/B): 128 connections
• ControlNet (1756-CNB/D, CNB/E): 40 connections

Optional Communication Modules

• ControlNet modules
• DeviceNet modules
• Remote I/O modules
• DH+ modules
• SynchLink modules

Programming Languages

For Safety Task (only):

• Ladder Diagram (LD)

For Standard Tasks:

• Ladder Diagram (LD)
• Structured Text (ST)
• Function Block Diagram (FBD)
• Sequential Function Chart (SFC)

Power Specifications

• Current Draw (1.2 VDC): 5 milliamps
• Current Draw (1.5 VDC): 1.2 Amps
• Power Dissipation: 6.2 Watts

Physical Specifications

• Weight: 0.394 kg (approx. 13.9 oz)
• Slot Width: One slot
• Display: 4-character alpha-numeric display
• Redundancy Support: Yes (with redundancy modules)

Compatible Chassis

• 1756-A4, 1756-A4K (4-slot)
• 1756-A7, 1756-A7K (7-slot)
• 1756-A10, 1756-A10K (10-slot)
• 1756-A13, 1756-A13K (13-slot)
• 1756-A17, 1756-A17K (17-slot) Series B and C

Compatible Power Supplies

Standard Power Supplies:

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

Redundant Power Supplies:

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

Redundancy Support

• Controller redundancy is supported with redundancy modules.
• Use ControlLogix redundancy modules for high availability.
• Compatible power supplies listed above for redundant systems.

Safety Level

• SIL Rating: SIL 2 (Safety Instrumentation Level)
• Suitable for safety applications up to SIL 2.
• Mixes standard ControlLogix I/O with safety I/O.
• Supports topologies that standard ControlLogix supports.

Operating Environment

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Relative Humidity: 5% to 95% non-condensing

Diagnostic Features

• Intuitive diagnostic display shows module status.
• Textual description of faults on the display.
• LED indicators for power, status, and I/O.
• Use Studio 5000 for detailed diagnostics.
• Monitor CPU load and memory usage.

Software Requirements

• Programming Software: Studio 5000 Automation Engineering & Design Environment
• RSLogix 5000 also compatible (check version)

Installation Guide

• Turn off all power before installation.
• Insert the Allen-Bradley 1756-L81ES into any chassis slot.
• Press firmly until the controller seats in the backplane.
• Secure the module with the retaining screws.
• Connect Ethernet cable to the 1GB port.
• Connect USB cable for programming if needed.
• Apply power and check the display for status.
• Configure the controller using Studio 5000 software.
• Download your safety and standard programs.

Removable Memory Note

• This controller uses 1756-SD2 removable memory.
• No other memory modules are compatible.
• Using wrong memory may cause module failure.

Maintenance Tips

• Check the alpha-numeric display for fault codes.
• Monitor battery status if using battery backup.
• Keep module free from dust and moisture.
• Ensure ambient temperature stays below 60°C.
• Perform regular program backups to 1756-SD2 memory.
• Replace controller if safety faults persist.

Package Contents

• One Allen-Bradley 1756-L81ES GuardLogix5580 controller
• One product label
• Memory card (1756-SD2) not included (order separately)

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Physical damage or overvoltage voids the warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: How much memory does the 1756-L81ES have?

The Allen-Bradley 1756-L81ES has 3 MB standard user memory. It also has 1.5 MB safety memory. Total memory is 4.5 MB. Nonvolatile memory is 2 GB integrated.

Q2: What programming languages does this controller support?

For safety tasks, only Ladder Diagram is supported. For standard tasks, you can use Ladder Diagram, Structured Text, Function Block Diagram, and Sequential Function Chart. This matches standard ControlLogix capabilities.

Q3: What communication ports are on the 1756-L81ES?

This controller has one USB 2.0 port at 12 Mbps. It also has one Ethernet port at 10/100/1000 Mbps. The Ethernet port supports up to 100 EtherNet/IP nodes.

Q4: Does the 1756-L81ES support controller redundancy?

Yes, this module supports redundancy with ControlLogix redundancy modules. Use compatible power supplies like 1756-PA75R or 1756-PB75R. Redundancy provides high availability for critical processes.

Q5: What removable memory works with this controller?

Only 1756-SD2 removable memory is compatible. Do not use other memory modules. The controller also has 2 GB of integrated nonvolatile memory for program storage.

Buying Guide

When you buy a Allen-Bradley 1756-L81ES GuardLogix5580 controller, follow these tips. First, verify your safety requirement. This controller meets SIL 2. Second, check your memory needs. You get 3 MB standard and 1.5 MB safety memory. Third, count your I/O points. This controller supports 128,000 digital I/O. Fourth, consider your network type. The built-in Ethernet port supports 1GB speed. Fifth, order optional communication modules for ControlNet or DeviceNet. Sixth, order 1756-SD2 memory card for removable storage. Seventh, select a compatible chassis from the list above. Eighth, choose a compatible power supply for your system. Ninth, plan for redundancy if needed. Order redundancy modules and special power supplies. Tenth, verify your software version. Use Studio 5000 for programming. Eleventh, review warranty terms. We offer 12 months coverage. Twelfth, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test the controller with a small safety program before full deployment.

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