Product Overview
Allen-Bradley 1762-L40BWAR is a 40-point compact controller within the Rockwell Automation MicroLogix 1200 series, combining a power supply, processor, embedded I/O, and communication ports in a single base unit designed for space-constrained control cabinets . The 1762-L40BWAR carries 24 digital inputs (20 standard 24V DC plus 4 fast 24V DC) and 16 relay outputs, powered from a 120/240V AC source, making it a self-contained control solution for small machinery and standalone automation cells . Its relay output architecture provides dry-contact switching capable of directly interfacing with AC or DC field loads without external interposing relays, a practical advantage in mixed-voltage control panels.
A distinguishing feature of the 1762-L40BWAR is its dual serial port configuration. In addition to the primary RS-232 channel (Channel 0) that supports DH-485, DF1 full/half-duplex, Modbus RTU, and ASCII protocols, the controller includes a dedicated Programmer/HMI Port that supports DF1 full-duplex communication with fixed parameters . This second port allows simultaneous connection of a programming terminal or PanelView HMI while Channel 0 remains available for network communication, barcode readers, or weigh scales—a level of connectivity flexibility uncommon in compact controllers of this class .
It is essential to note that Rockwell Automation discontinued the 1762-L40BWAR on August 25, 2021, with an engineering replacement category designation . For facilities maintaining existing MicroLogix 1200 installations, the 1762-L40BWAR remains a critical spare for sustaining production continuity. For new deployments, migration to current Micro800 or CompactLogix platforms is the appropriate path.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1762-L40BWAR |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | MicroLogix 1200 Programmable Controller |
| Input Power | 120/240V AC |
| Total I/O | 40 points (24 inputs, 16 outputs) |
| Digital Inputs | 20 standard 24V DC + 4 fast 24V DC |
| Output Type | 16 relay outputs (dry contact) |
| Relay Voltage Range | 5–125V DC / 5–265V AC |
| Max Continuous Current per Relay | 2.5 A (240V AC), 2.0 A (24V DC) |
| Max Continuous Current per Common | 8.0 A |
| Max Signal Delay (resistive) | On: 10 ms / Off: 10 ms |
| Off-State Leakage Current | 0 mA |
| Communication Ports | 2 × RS-232C |
| Channel 0 Protocols | DH-485, DF1 Full/Half-duplex, Modbus RTU, ASCII |
| Programmer/HMI Port | DF1 Full-duplex only (fixed parameters) |
| Memory | 6 KB |
| Programming Software | RSLogix 500 (revision 4.5+ for Series B features) |
| Operating Temperature | 0°C to 55°C |
| Relative Humidity | 5%–95%, non-condensing |
| Hazardous Location Rating | Class I, Division 2, Groups A, B, C, D (Series C) |
| Mounting | Panel or DIN rail |
| Dimensions | Approximately 233 × 160 × 45 mm |
| Discontinued Status | Yes (August 25, 2021) |
