The Allen-Bradley 1772-LX, also cataloged as the 1772LX Mini PLC Processor, operates as a dedicated hardware component for executing controller logic processing and digital I/O control within PLC-2/16 programmable control systems.

Model Identification and Configuration

The Allen-Bradley 1772-LX is a processor module designed for PLC-2/16 systems without an integrated power supply. The unit performs application program execution and controller communication through the PLC backplane interface.

The module requires a defined backplane current supply and is configured for digital control applications using 10-32 VDC field signals.

PLC-2 Processor Function

The 1772-LX provides central processing functions for PLC-2/16 control systems. The processor module executes stored control logic, manages digital input and output operations, and exchanges data through the PLC backplane.

The module follows the Allen-Bradley PLC architecture where processor execution, I/O handling, and system communication are separated between dedicated hardware assemblies.

PLC Backplane and Control Architecture

The 1772-LX requires a 5 VDC backplane supply with a specified current demand of 1.25 A. Correct power distribution and backplane connection are required for proper processor operation.

The processor architecture uses fixed hardware communication paths rather than modern Ethernet-based networks. System expansion depends on compatible PLC-2 series racks and I/O modules.

Ordering Information

• 1 x Allen-Bradley 1772-LX Mini PLC 2/16 Processor Module
• 1 x PLC-2 series processor assembly
• 1 x Backplane connection interface
• Power supply module is not included
• Compatible PLC-2 series I/O hardware is ordered separately

Field Installation Guidelines

Processor Installation

• Disconnect system power before installing or removing the processor module.
• Verify rack position and PLC-2 system compatibility before installation.
• Ensure the processor connector is fully seated in the backplane.
• Avoid mechanical stress on module terminals and PCB connections.

Electrical Connection

• Confirm the 5 VDC backplane supply meets the processor current requirement.
• Use proper grounding methods for the controller chassis.
• Verify digital I/O voltage levels before connecting field devices.
• Tighten terminal screws according to specified torque requirements.

Environmental Control

• Install the processor inside a suitable industrial enclosure.
• Prevent dust, moisture, and conductive contamination from reaching the module.
• Maintain cable separation between control wiring and high-voltage circuits.

Frequently Asked Questions

• What PLC system uses the 1772-LX processor?

  The 1772-LX is designed for Allen-Bradley PLC-2/16 programmable controller systems.

• Does the 1772-LX include a power supply?

  No. The processor module is supplied without an integrated power supply.

• What backplane power is required?

  The module requires 1.25 A at 5 VDC from the PLC backplane supply.

• What type of applications does this processor support?

  The processor supports digital control applications using 10-32 VDC field signals.

• Can the module be installed while the rack is powered?

  No. Power should be removed before processor installation or replacement.

• What communication method does the module use?

  The module communicates through the PLC-2 backplane architecture and compatible system hardware.

• What output power rating is specified for the system?

  The specified output rating is 4 A at 5 VDC.

• What installation check is required before operation?

  Verify rack compatibility, backplane power, grounding, and I/O connections before startup.