Allen Bradley 1756-L71K ControlLogix 5570 2MB CPU

Product Overview

The Allen-Bradley 1756-L71K is a conformal-coated ControlLogix 5570 processor with 2 MB user memory. It provides high-performance control with integrated USB communication, supporting 128,000 I/O points and full controller redundancy for demanding industrial applications.

Key Specs

• User memory: 2 MB
• I/O memory: 0.98 MB
• Max I/O: 128,000 digital, 4000 analog
• Communication: 1 USB port, optional EtherNet/IP, ControlNet, DeviceNet
• Non-volatile memory: 1 GB (1784-SD1, ships with controller)
• Current draw: 5 mA @ 1.2 V DC, 800 mA @ 5.1 V DC
• Power dissipation: 2.5 W

Why Choose This

• Conformal coating protects against corrosive environments
• Full controller redundancy support for high-availability systems
• Integrated motion on EtherNet/IP and SERCOS interface options
• Energy Storage Module eliminates battery maintenance

Common Questions

• What does the K suffix mean? Conformal coating for harsh or corrosive environments.
• How many tasks does it support? 32 tasks with 100 programs per task.
• Is redundancy supported? Yes, full controller redundancy with 1756-RM2 modules.

Mounting Steps

1. Install the controller in any slot of a 1756 chassis.
2. Insert the 1784-SD1 Secure Digital card for non-volatile storage.
3. Connect the USB port for programming or install communication modules.
4. Verify the Energy Storage Module is fully seated.
5. Download the application using Studio 5000 Logix Designer.

Buying Advice

• Choose 1756-L71K for corrosive environments; use 1756-L71 for standard conditions.
• For 4 MB memory, select the 1756-L72K.
• Pair with 1756-RM2K redundancy modules for high-availability architectures.