Allen-Bradley 1762-L24BWA MicroLogix 1200 PLC

1762-L24BWA MicroLogix 1200 Programmable Controller

Product Introduction

The 1762-L24BWA from Allen‑Bradley is a self‑contained programmable logic controller within the MicroLogix 1200 family. This compact unit integrates a power supply, processor, memory, and I/O into a single enclosure. Consequently, it reduces installation time and simplifies panel layout.

This controller features fourteen 24V DC digital inputs, which include ten standard inputs and four fast‑response inputs for high‑speed counting applications. These inputs support both sink and source wiring configurations, offering flexibility when connecting to various sensors and switches. Additionally, the 1762-L24BWA provides ten relay outputs that can switch both AC and DC loads, making them ideal for driving contactors, solenoids, and indicator lamps.

Moreover, the built‑in RS232 communication port supports DF1, DH‑485, Modbus (Master and Slave), and ASCII protocols. This versatility enables seamless integration with HMIs, SCADA systems, and other intelligent devices. The controller also includes two onboard potentiometers for analog simulation, which is useful for testing and commissioning without external signal generators.

Furthermore, the 1762-L24BWA operates on a wide AC supply range from 120 to 240V AC, accommodating global power standards. Its compact dimensions and dual mounting options (DIN rail or panel) make it suitable for control panels with limited space. Whether you are building a new machine or upgrading an existing system, this controller delivers dependable performance at an economical price point.

Technical Specifications

The 1762-L24BWA offers robust performance across its I/O, communication, and power features. Key parameters are detailed below:

Power Supply

• Nominal input voltage: 120/240V AC (operating range 120–240V AC)

• Operating frequency: 47–63 Hz

• Inrush current:

  • 25A for 8 ms at 120V AC

  • 40A for 4 ms at 240V AC

• Heat dissipation: 15.7 W

Input Specifications (14 DC Inputs)

• Input type: 24V DC (sink/source configurable)

• Input configuration:

  • 10 standard inputs

  • 4 fast‑response inputs (for high‑speed counting)

• Nominal input voltage: 24V DC

Output Specifications (10 Relay Outputs)

• Contact configuration: Normally open (Form A)

• Contact voltage range: 24–125V DC; 120–240V AC

• Mechanical life: 20,000,000 cycles

• Minimum load per point: 10 mA

Communication

• Port: 1 x 8‑pin mini‑DIN RS232 port

• Supported protocols:

  • DF1 (Full‑duplex and Half‑duplex)

  • DH‑485

  • Modbus (Master and Slave)

  • ASCII

• Note: External interface converters (e.g., 1761‑NET‑AIC) may be used for network multiplexing

Additional Features

• Two onboard potentiometers for analog simulation

• Real‑time clock option (replaceable module)

• Master control relay support for emergency shutdown

These specifications ensure that the 1762-L24BWA can handle a wide range of machine control tasks efficiently. The combination of standard and fast inputs provides flexibility for both general‑purpose and high‑speed applications.

Mechanical & Environmental Ratings

The controller is built for industrial environments. Its mechanical and environmental characteristics include:

• Dimensions (H x W x D):

  • 90 x 110 x 87 mm (3.54 x 4.33 x 3.43 in.)

  • 104 mm height with DIN latch open

• Weight: Approximately 0.9 kg (2.0 lb)

• Mounting: 35 mm DIN rail or direct panel mounting

• Operating temperature: 0–55 °C (32–131 °F)

• Storage temperature: –40 to 85 °C (–40 to 185 °F)

• Relative humidity: 5–95% non‑condensing

• Vibration tolerance: 1.5G at 10–500 Hz

• Shock tolerance: 15G

• Certifications: Complies with EMC Directive 89/336/EEC

The compact width of 110 mm allows the 1762-L24BWA to fit into tight enclosures. Always ensure horizontal mounting for proper ventilation and heat dissipation.

Installation Guidelines

Proper installation of the 1762-L24BWA ensures optimal performance and longevity. Follow these steps:

1. Mounting: Secure the controller on a 35 mm DIN rail or directly onto a mounting plate using the provided slots. Ensure horizontal orientation and maintain adequate clearance for airflow around the unit.

2. Power Connection: Connect the AC power supply to the designated input terminals. Verify that the voltage and frequency match the controller’s ratings. Install appropriate overcurrent protection (fuse or circuit breaker) as per local electrical codes.

3. Grounding: Connect the ground terminal to the system’s protective earth. A low‑impedance ground path is essential for both safety and noise reduction.

4. Input Wiring: Connect DC field devices to the input terminals. Configure each input as sink or source according to your sensor wiring. For fast inputs, use shielded cables to minimise noise.

5. Output Wiring: Connect loads to the relay output terminals. For inductive loads, install external surge suppression (RC snubbers or varistors) to protect relay contacts and extend service life.

6. Communication: Connect the RS232 port to an HMI, programming terminal, or other compatible device. Use an external converter (e.g., 1761‑NET‑AIC) if network multiplexing is required.

7. Configuration: Use RSLogix 500 or Connected Components Workbench to program the controller. Configure I/O, communication parameters, and application logic as required.

Important Safety Notes:

• Always disconnect power before removing or inserting expansion I/O modules.

• Electrical arcing can damage connectors and reduce product reliability.

• Use a master control relay for emergency machine shutdown.

After installation, power up the system and verify that the 1762-L24BWA operates correctly. Check the status LEDs for power, run, and fault conditions. Always follow ESD precautions when handling the unit.

Packaging List

When you order the 1762-L24BWA, the package includes:

• 1762-L24BWA MicroLogix 1200 controller (1 unit)

• Removable terminal blocks (input and output)

• DIN‑rail mounting clips (pre‑installed)

• Quick‑start installation guide (printed)

Note: Programming cables, software, communication converters, and expansion I/O modules are sold separately.

Frequently Asked Questions (FAQ)

1. What are the four "fast" inputs used for?
The four fast‑response inputs on the 1762-L24BWA are designed for high‑speed counting applications, such as encoder feedback or high‑frequency pulse detection. They offer faster response times than standard inputs.

2. Can I use this controller as a Modbus master?
Yes, the built‑in RS232 port supports Modbus Master protocol. This allows the 1762-L24BWA to communicate with multiple Modbus slave devices, such as drives, instruments, and remote I/O.

3. What is the purpose of the two potentiometers?
The two onboard potentiometers provide 0–5V or 0–10V analog signals that can be read by the controller. They are useful for simulating analog inputs during testing, commissioning, or as a manual setpoint source.

4. How many expansion modules can I add to this controller?
The 1762-L24BWA supports up to 6 expansion I/O modules from the MicroLogix 1200 family. However, ensure that the total current draw does not exceed the controller’s internal power supply capacity.

5. What shipping carriers do you use?
We ship all orders via FedEx, UPS, or DHL to ensure fast and reliable delivery worldwide. Please contact our sales team for tracking information and estimated delivery times.