Technical Specifications of Allen-Bradley 1756-L75

The 1756-L75 belongs to the ControlLogix Logix5575 series. This processor is the most powerful unit in the 5570 controller family.

• User Memory: 32 MB for large data and complex logic

• I/O Memory: 0.98 MB (980 KB) for fast I/O handling

• Maximum Total I/O: 128,000 points

• Maximum Digital I/O: 128,000 points

• Maximum Analog I/O: 4,000 points

• Current Draw (5.1V DC): 800 mA

• Current Draw (1.2V DC): 5.0 mA

• Power Dissipation: 2.5 Watts

• Thermal Dissipation: 8.5 BTU per hour

• Isolation Voltage: 30 Volts continuous basic insulation

• Product Weight: Approximately 0.85 kg

Environmental and Physical Ratings

The 1756-L75 operates reliably in harsh industrial environments without a battery.

• Operating Temperature: 0 to 60 degrees Celsius

• Storage Temperature: -40 to 85 degrees Celsius

• Maximum Surrounding Air Temperature: 60 degrees Celsius

• Relative Humidity: 5% to 95% noncondensing

• Vibration: 2 g at 10 to 500 Hz

• Operating Shock: 30 g

• Non-Operating Shock: 50 g (45 g with SD card installed)

• Enclosure Type: None (open-style module)

Communication and Built-in Ports

This processor includes a built-in USB port for easy programming.

• USB 2.0 Port: One dedicated programming and download port

• USB Transmission Speed: Up to 12 Mbps

• Use the USB port for initial configuration downloads

• Supports EtherNet/IP, ControlNet, and DeviceNet networks

• Supports Data Highway Plus (DH+) and SynchLink

• Supports Remote I/O (RIO) and third-party networks

Programming Languages and Software Support

The 1756-L75 accepts multiple IEC 61131-3 programming languages.

• Ladder Diagram (LD) for discrete logic control

• Structured Text (ST) for complex algorithms

• Function Block Diagram (FBD) for process control

• Sequential Function Chart (SFC) for batch processes

• Compatible with PlantPAx Distributed Control System (DCS)

Battery-Free Energy Storage System

The 1756-L75 uses capacitor energy storage instead of batteries. This is an eco-friendly solution for volatile memory retention.

• Three capacitor energy storage modules total

• Two removable modules for flexible backup options

• One non-removable module for basic protection

• Removable module 1756-ESMCAP ships installed

• Removable module 1756-ESMNSE has no WallClockTime backup

• Non-removable module 1756-ESMNRM prevents SD card and USB use

Memory and Storage Features

The 1756-L75 ships with a Secure Digital (SD) card included.

• Included SD Card: One 1784-SD1 with 1 GB nonvolatile memory

• Use the SD card for program storage and transfer

• Supports 32 controller tasks maximum

• Up to 100 programs per task

• Event tasks support all event triggers

• Maximum 500 controller connections

Chassis and Power Supply Compatibility

Use only compatible chassis and power supplies with this module.

• Compatible ControlLogix chassis: 1756-A4, A4K, A7, A7K, A10, A10K, A13, A13K, A17, A17K

• Standard power supplies: 1756-PA50, PA72, PA72K, PA75, PA75K, PB50, PB72, PB72K, PB75, PB75K, PH75

• Redundant power supplies: 1756-PA75R, PA75RK, PB75R, PB75RK, PSCA2, PSCA2K

Installation Guidelines for 1756-L75

Follow these steps for a safe and correct installation.

1. Turn off all power to the ControlLogix chassis.

2. Insert the 1756-L75 into any slot of a compatible chassis.

3. Push the module until the latch clicks firmly into place.

4. Tighten the top and bottom screws to secure the module.

5. Connect the USB cable for initial programming if needed.

6. Insert the 1784-SD1 card into the SD slot if required.

7. Apply power and verify the LED status indicators.

8. Download your user program using Studio 5000 software.

Always wear proper grounding protection during installation. This controller works in simple or redundant configurations. Multiple controllers can operate independently in the same chassis.

Package Contents for Allen-Bradley 1756-L75

• One Allen-Bradley 1756-L75 ControlLogix processor module

• One 1784-SD1 Secure Digital (SD) card (1 GB)

• One 1756-ESMCAP removable capacitor energy storage module (pre-installed)

• One product information sheet

Frequently Asked Questions (FAQ)

1. Does the 1756-L75 require a battery for memory retention?

No, the 1756-L75 uses capacitor energy storage modules instead of batteries. This is a battery-free and eco-friendly design.

2. What is the maximum number of connections for the 1756-L75?

The 1756-L75 supports up to 500 controller connections simultaneously. This is higher than older ControlLogix processors.

3. Can the 1756-L75 work with PlantPAx DCS?

Yes, the 1756-L75 is fully compatible with the PlantPAx Distributed Control System by Rockwell Automation.

4. Is the 1756-L75 suitable for redundant control systems?

Yes, the 1756-L75 works in both simple and redundant controller configurations. Use it with redundant power supplies for high availability.

5. What SD card comes with the 1756-L75?

The 1756-L75 ships with one 1784-SD1 SD card. This card provides 1 GB of nonvolatile memory for program storage.

Ordering and Compliance Information

The Allen-Bradley 1756-L75 meets standard industrial safety and emission requirements. You do not receive any certificate with this product. This module has a UPC of 10612598876058. Always verify your chassis and power supply compatibility before ordering. The 1756-L75 is the most powerful Logix 5570 series controller. Use this processor for large and sophisticated automation projects. It handles up to 128,000 digital I/O points easily. The built-in USB port allows fast 12 Mbps programming downloads. Program the 1756-L75 using Studio 5000 software with four IEC languages. This controller accepts user programs developed in Ladder Diagram, Structured Text, Function Block Diagram, and Sequential Function Chart.