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1764-24BWA
1764-24BWA
1764-24BWA
1764-24BWA

Allen-Bradley 1764-24BWA MicroLogix 1500 Base Controlle

  • Model: 1764-24BWA
  • Brand: Allen-Bradley (Rockwell Automation)
  • Series: MicroLogix 1500
  • Core Function: Modular PLC base controller
  • Product Type: Base Controller with Integrated I/O
  • Key Specs: 12 × 24 VDC inputs, 12 relay outputs, 85–265 VAC power input
  • ⚠️ Obsolete Model – Limited Stock Available
  • Condition: New Original (New Surplus) or Professionally Tested Refurbished
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Description

Key Technical Specifications

Parameter Value
Product Type MicroLogix 1500 Base Controller
Integrated I/O 12 digital inputs, 12 relay outputs
Input Type 24 VDC sink/source
Output Type Relay
Line Power 85–265 VAC, 47–63 Hz
User Power Output 24 VDC, 400 mA
Communication Port RS-232C
Expansion Capability Supports MicroLogix 1500 processor and 1769 expansion I/O
Mounting DIN rail or panel mount
Operating Temperature 0 °C to 55 °C
Storage Temperature -40 °C to 85 °C
Operating Humidity 5–95% non-condensing

The 1764-24BWA is a MicroLogix 1500 base controller with 12 × 24 VDC digital inputs, 12 relay outputs, an 85–265 VAC power supply, and an integrated RS-232C communication port. Rockwell Automation discontinued this model on May 4, 2017, and recommends a functional replacement for new installations.

 

Product Introduction

The Allen-Bradley 1764-24BWA is a modular base controller designed for MicroLogix 1500 automation systems. It combines integrated digital I/O, an AC-powered supply, and processor expansion capability into a compact platform suitable for packaging equipment, material handling systems, machine automation, and process control.

Unlike the fixed-I/O MicroLogix 1000 series, the MicroLogix 1500 architecture allows processor upgrades and supports 1769 expansion I/O modules. This flexibility enables existing systems to accommodate additional field devices without replacing the entire controller, making the 1764-24BWA a practical choice for maintaining legacy installations.

1764-24BWA

1764-24BWA

1764-24BWA

1764-24BWA

1764-24BWA

1764-24BWA

Installation & Configuration Guide

 

Stage 1 – Pre-Installation Preparation (5–10 Minutes)

⚠️ Safety First

  1. Notify operations of the planned shutdown.
  2. Apply Lock-Out/Tag-Out procedures.
  3. Disconnect the 85–265 VAC supply.
  4. Wait at least five minutes before servicing.

Required Tools

  • ESD wrist strap
  • Digital multimeter
  • Phillips screwdriver
  • Wire identification labels
  • Laptop with RSLogix 500

Before Removal

  • Upload the PLC application.
  • Record communication parameters.
  • Photograph terminal wiring.
  • Document installed processor and expansion modules.

 

Stage 2 – Remove Existing Controller (5 Minutes)

  1. Verify AC power is OFF.
  2. Disconnect field wiring.
  3. Remove communication cables.
  4. Release the mounting clips.
  5. Inspect expansion bus connectors and terminal blocks.

⚠️ Keep the original controller until the replacement has completed commissioning successfully.

 

Stage 3 – Install the New Controller (10 Minutes)

  1. Confirm the replacement catalog number is 1764-24BWA.
  2. Mount the base securely.
  3. Install the compatible MicroLogix 1500 processor.
  4. Reconnect field wiring and expansion modules.
  5. Verify the AC input and protective earth connection.
  6. Restore the controller program if required.

Installation Checklist

  • ✔ Correct catalog number
  • ✔ Processor fully seated
  • ✔ Expansion bus connected
  • ✔ Field wiring verified
  • ✔ AC power confirmed

 

Stage 4 – Power-Up & Functional Testing (10–15 Minutes)

  1. Apply AC power.
  2. Verify the POWER and RUN indicators.
  3. Connect using RSLogix 500.
  4. Confirm processor communication.
  5. Test all digital inputs and relay outputs.
  6. Verify operation of all connected 1769 expansion modules.

⚠️ Troubleshooting

  • Controller does not start: verify incoming AC voltage.
  • Expansion I/O fault: inspect the processor-to-base connection.
  • Relay outputs fail to energize: verify external load voltage and relay wiring.

 

Frequently Asked Questions

Q1. Is the 1764-24BWA still manufactured?

No. Rockwell Automation discontinued the 1764-24BWA on May 4, 2017. It is now considered a legacy product, and most available inventory consists of new surplus or professionally refurbished units.

Q2. What I/O is integrated into the base unit?

The base provides 12 × 24 VDC digital inputs and 12 relay outputs, making a total of 24 onboard I/O points.

Q3. Can I add expansion modules?

Yes. Unlike the MicroLogix 1000 family, the MicroLogix 1500 platform supports compatible 1769 Compact I/O expansion modules, allowing system growth without replacing the base controller.

Q4. What power supply does the 1764-24BWA require?

The controller operates from 85–265 VAC at 47–63 Hz and also provides a 24 VDC, 400 mA user power output for field devices.

Q5. What software is used to program the controller?

The MicroLogix 1500 platform is programmed with RSLogix 500 and communicates through the integrated RS-232C serial port.

Q6. What should I verify before ordering?

Confirm the following:

  • Catalog number (1764-24BWA)
  • Installed MicroLogix 1500 processor model
  • 85–265 VAC power availability
  • Required digital I/O count
  • Compatibility with installed 1769 expansion modules
  • Existing RSLogix 500 project and communication settings

A common field mistake is replacing only the base while overlooking processor compatibility. Before ordering, verify both the 1764 base unit and the installed 1764-LRP processor catalog number to avoid unnecessary commissioning delays.

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