Allen-Bradley 1762-L24AWA​ MicroLogix 1200 PLC – 24-Point Controller with 120/240V AC Power, 14 x 120V AC Inputs & 10 Relay Outputs

Description

Main Features and Advantages

The Allen-Bradley 1762-L24AWA​ delivers a compelling set of features that make it a preferred compact PLC for OEMs and system integrators who require reliable AC-powered control with minimal panel space.Integrated 120/240V AC power supply: Unlike DC-powered micro PLCs that require an external 24 V DC power supply, the 1762-L24AWA​ connects directly to standard industrial AC mains (100–240 V AC), simplifying panel wiring and reducing auxiliary component cost. This is especially advantageous in retrofit applications where only AC power is readily available.Embedded 120V AC digital inputs and relay outputs: Fourteen 120V AC sinking/sourcing inputs allow direct connection to standard AC proximity switches, pushbuttons, selector switches, and limit switches without interposing relays. Ten isolated electromechanical relay outputs provide universal load-switching capability for AC (up to 250 V AC) and DC (up to 30 V DC) loads within rated current, giving designers flexibility to control contactors, pilot lights, solenoids, and small motors from a single controller.Expandable rackless I/O architecture: The 1762-L24AWA​ supports up to six 1762-series expansion modules—including additional discrete I/O, analog I/O (1762-IF2OF2, 1762-IF4, 1762-OF4), thermocouple/RTD modules (1762-IR4, 1762-IT4), and communications modules—connected via a high-speed local I/O bus. This rackless design eliminates the cost and space penalty of traditional I/O racks while preserving scalability for evolving application requirements.Advanced communication and protocol flexibility: The onboard RS-232 port supports Rockwell DF1 for programming and HMI connectivity, DH-485 for peer-to-peer networking with PanelView terminals or other MicroLogix controllers, as well as Modbus RTU slave/master and ASCII free-form messaging. The channel can be toggled between user-configured parameters and default settings via a communication switch, ensuring recovery access even if communication settings were misconfigured.Robust industrial design and diagnostics: Engineered for harsh environments, the 1762-L24AWA​ withstands operating vibration of 5 G (10–500 Hz), operating shock of 30 G, and relay-operation vibration of 1.5 G. LED status indicators for PWR, RUN, FLT, FORCE, and I/O points provide immediate visual diagnostics. The controller also supports forced I/O via password-protected software, data file retentive memory with battery-backed areas, and optional real-time clock (via plug-in memory module 1762-MM1 or 1762-MM2).Legacy continuity and worldwide acceptance: Despite its discontinued new-sale status, the 1762-L24AWA​ continues to be extensively stocked by industrial automation distributors for MRO/spare requirements. Its broad agency certifications—including UL, c-UL, CE, and C-Tick for Class I Division 2 hazardous locations—ensure compliance across North American, European, and Asia-Pacific installations.

Application Field

The Allen-Bradley 1762-L24AWA​ is widely deployed in small-scale machine control, stand-alone equipment automation, and distributed control nodes within larger systems. Its native 120V AC input capability and relay outputs make the 1762-L24AWA​ particularly suitable for packaging machinery (form-fill-seal, case erectors, labelers), conveyor and material handling systems (divert gates, accumulation zones, sortation stations), and small process skids such as batch mixing, pump control, and tank level monitoring where 120V AC field devices predominate.In building automation and facility management, the 1762-L24AWA​ is often used to control HVAC auxiliary equipment, lighting contactor panels, sump/ejector pump stations, and access-controlled door interlocks—benefiting from its ability to directly accept 120V AC dry-contact signals from fire/security panels and switch AC loads through its relay outputs. For OEM machine builders, the compact footprint and AC-powered design of the 1762-L24AWA​ reduce enclosure size and wiring complexity, allowing the controller to be embedded inside equipment enclosures with minimal engineering overhead.Retrofit and modernization projects also represent a significant application segment: plants migrating away from obsolete relay-logic panels or early-generation micro PLCs frequently select the 1762-L24AWA​ to preserve familiarity with RSLogix 500 programming while gaining integrated diagnostics, expandable I/O, and network connectivity options. Where Class I Division 2 hazardous area approvals are required—such as in oil & gas upstream facilities, chemical dosing stations, or grain handling—installed 1762-L24AWA​ units meeting UL 1604/CSA C22.2 No. 213 provide a certified control solution. For applications demanding Ethernet/IP or greater I/O density, Rockwell recommends migration to the Micro800 (Micro850/Micro870) or CompactLogix families, though the 1762-L24AWA​ remains the go-to choice for maintaining existing MicroLogix 1200-based installations.

Related Products

• 1762-L24BWA​ — MicroLogix 1200 24-point controller with 120/240V AC power, 14 × 24 V DC sink/source inputs, 10 relay outputs, and built-in 24 V DC sensor power (250 mA); DC-input alternative to the 1762-L24AWA.
• 1762-L24AWAR​ — Same as 1762-L24AWA​ but adds a second RS-232/RS-485 combo port (Channel 1) for simultaneous HMI and programming or peer-to-peer communication.
• 1762-L40AWA​ — MicroLogix 1200 40-point controller: 24 × 120V AC inputs, 16 relay outputs, 120/240V AC power; larger I/O version of the 1762-L24AWA.
• 1762-IF2OF2​ — 2-channel analog input / 2-channel analog output expansion module compatible with the 1762-L24AWA​ for adding 0–10 V or 4–20 mA analog capability.
• 1762-IA8​ — 8-channel 120 V AC discrete input expansion module for extending the input count of systems based on the 1762-L24AWA.
• 1762-OA8​ — 8-channel 120/240 V AC triac output expansion module; complements the relay outputs of the 1762-L24AWA​ where fast AC switching is needed.
• 1762-MM1​ — 32 KB memory module with real-time clock (RTC) and battery; plugs into the 1762-L24AWA​ to provide non-volatile recipe storage and time-stamped event logging.
• 2080-LC50-24AWB​ — Micro850 24-point AC-powered controller; Rockwell-recommended modern replacement/upgrade path for the discontinued 1762-L24AWA.

Installation and Maintenance

Pre-installation preparation: Before mounting the 1762-L24AWA, verify that the supply voltage at the installation site falls within the acceptable range of 100–240 V AC (85–264 V AC tolerance) at 47–63 Hz and that the branch circuit is protected by an appropriately sized overcurrent device (typically 2 A slow-blow fuse or circuit breaker). Ensure the DIN rail (35 mm top-hat EN 50022) or panel mounting surface is clean, grounded, and provides adequate clearance—minimum 50 mm above and below the 1762-L24AWA—for heat dissipation and wiring access. Remove power from the circuit before making any connections. Wire the AC supply to terminals L1 and L2/N observing proper polarity for 120 V AC single-phase or 230 V AC configurations, and tighten terminal screws to the torque specified in the 1762-IN006 installation instructions (typically 0.8–1.0 N·m / 7–9 lb-in). Connect 120 V AC field devices to the input terminals (0–13) and load wiring to the relay output commons and normally-open/normally-closed contacts (0–9). Use ferrules on stranded wire where required by local code. After wiring, perform a visual inspection for loose strands and verify that no short circuits exist before applying power. The 1762-L24AWA​ will indicate POWER LED illumination when correctly energized.Maintenance recommendations: The 1762-L24AWA​ is a solid-state electronic device with no user-serviceable internal components; routine maintenance consists primarily of periodic visual inspection and verification of terminal tightness (recommended annually or per site PM schedule, especially in vibrating environments). Relay outputs have a mechanical life of approximately 20 million operations at minimum rated load and an electrical life dependent on switched current/voltage—monitor high-cycle relay applications and plan replacement if contact resistance increases or switching becomes unreliable. Keep the controller enclosure clean and free of conductive dust; do not use solvents on the plastic housing. If a memory module such as the 1762-MM1 is installed for RTC and recipe retention, replace the coin cell (typically CR2032) inside the memory module per manufacturer recommendation (every 3–5 years). Firmware updates for the 1762-L24AWA​ can be performed via the RS-232 programming port using Rockwell Automation’s Flash Upgrade utility when connected to a PC running RSLogix 500-compatible software. In the event of a FAULT LED indication, consult the MicroLogix 1200 User Manual (publication 1762-UM001) for fault code interpretation and corrective action. For spare-part continuity, maintain a spare 1762-L24AWA​ or verified functional equivalent in critical-process MRO inventories.