Product Overview
The Allen-Bradley 1762-L40AWAR is a MicroLogix 1200 Programmable Logic Controller (PLC) engineered for demanding industrial automation environments. This compact controller integrates 24 discrete inputs and 16 relay outputs, along with dual serial communication ports, making it a versatile solution for machine control, process monitoring, and remote I/O applications. Designed by Rockwell Automation, the 1762-L40AWAR offers reliable performance and expandability for small to mid-scale control systems.
With its robust AC input capability and relay outputs rated for high-current loads, the 1762-L40AWAR simplifies wiring and reduces the need for external interface modules. Its support for multiple protocols, including DF1, DH-485, ASCII, and MODBUS, ensures seamless integration with existing PLC networks and third-party devices.
Technical Specifications
Below are the key specifications for the Allen-Bradley 1762-L40AWAR:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Part Number |
1762-L40AWAR |
| Power Supply |
120 to 240 Volts AC |
| Number of Inputs |
24 (120V AC) |
| Number of Outputs |
16 (Relay) |
| Input Circuit Type |
120 Volts AC |
| Output Circuit Type |
Relay |
| Relay Contact Rating |
24-125VDC; 120-240VAC |
| Mechanical Cycles |
20,000,000 |
| Load Current |
10A, minimum |
| Communication Ports |
One 8-Pin mini-DIN serial port; One programming port |
| Supported Protocols |
DF1, DH-485, ASCII, MODBUS |
| Dimensions (H x W x D) |
90 mm (104 mm with DIN latch open) x 160 mm x 87 mm |
| Shipping Weight |
2.4 pounds |
| Ambient Operating Temp |
0 to 55 °C |
| Power Supply Usage |
82 VA |
| Inrush Current |
120V AC: 25A for 8 ms; 240V AC: 40A for 4 ms |
Real-World Applications
The Allen-Bradley 1762-L40AWAR excels in applications requiring reliable discrete control and protocol flexibility. Typical use cases include:
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Packaging machinery – Controlling conveyor systems, labeling units, and filling stations with high-speed input sensing and relay actuation.
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HVAC control – Managing fans, dampers, and compressors using temperature and pressure inputs, with relay outputs driving contactors.
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Water treatment – Automating pump sequences, valve positioning, and alarm handling, leveraging MODBUS connectivity for remote monitoring.
Its ability to communicate via MODBUS Master/Slave eliminates the need for protocol converters, reducing system cost and complexity, especially when integrating smart relays, power meters, or variable frequency drives.
Installation & Setup Guidance
Mount the 1762-L40AWAR on a standard DIN rail within an enclosure that provides adequate protection per the installation area. Ensure proper clearance for heat dissipation and cable routing. The unit supports both sink and source wiring for inputs; verify the input wiring matches the chosen configuration. For relay outputs, observe the contact ratings (24-125VDC or 120-240VAC) and use appropriate external fusing or circuit breakers. Connect the programming port using an Allen-Bradley 1761-CBL-PM02 cable or equivalent for downloading user programs.
Maintenance & Reliability
Routine inspection every 6 to 12 months is recommended to ensure reliable operation. Check for dust accumulation on the ventilation slots and verify that all terminal screws remain tight. The relay outputs have a mechanical life of 20,000,000 cycles, but under high inductive loads, contact wear may occur; consider using RC snubbers or solid-state relays for frequent switching. Operate the controller within the 0 to 55 °C ambient range; if the enclosure temperature approaches the upper limit, install cooling fans or air conditioning. These simple steps maximize uptime and extend the service life of your 1762-L40AWAR.
Compatibility & Integration
The 1762-L40AWAR supports DF1, DH-485, ASCII, and MODBUS protocols over its RS232-compatible serial ports. This allows direct connection to a wide range of HMIs, SCADA systems, and third-party devices. For MODBUS, the controller can act as a master or slave, enabling seamless integration with smart relays, power meters, and other MODBUS-capable instruments without additional hardware. The DH-485 protocol facilitates networking with other Allen-Bradley controllers, while ASCII communication is ideal for barcode scanners and serial printers.
Selection Guide & Purchasing Advice
Before purchasing the 1762-L40AWAR, verify your system voltage matches the 120-240V AC power supply range. Confirm the input and output requirements align with your application—24 AC inputs and 16 relay outputs. Ensure your programming software is compatible with the MicroLogix 1200 series. For a reliable source, PLC Source PRO offers genuine Allen-Bradley modules with competitive pricing and fast shipping. When ordering, specify the exact part number to avoid compatibility issues.