Allen-Bradley 1766-L32BXBA – 32-Point Compact PLC with Embedded EtherNet/IP | MicroLogix 1400 Series
Engineering Background
The MicroLogix 1400 platform was introduced by Rockwell Automation as a high-density, network-capable successor to the MicroLogix 1100 family. Designed for space-constrained panel environments, the 1766-L32BXBA integrates 32 onboard I/O points, dual communication ports, and a built-in LCD operator interface into a single compact housing — eliminating the need for separate HMI hardware in many standalone machine applications.
Product Positioning
The 1766-L32BXBA is the preferred choice for OEM machine builders and system integrators who require deterministic ladder-logic execution, native EtherNet/IP connectivity, and robust 24 V DC transistor output drive — all within a DIN-rail footprint under 180 mm wide. It bridges the gap between micro PLCs and full-rack ControlLogix systems, making it ideal for mid-complexity automation cells.
Complete Technical Specifications
- Catalog Number: 1766-L32BXBA
- Series / Platform: MicroLogix 1400
- Manufacturer: Allen-Bradley / Rockwell Automation
- Power Supply: 24 V DC (20.4 – 26.4 V DC operating range)
- Total Onboard I/O: 32 points
- Digital Inputs: 20 × 24 V DC sink/source
- Digital Outputs: 12 × 24 V DC transistor (source), 0.5 A per point
- Analog I/O: 2 × analog inputs (0–10 V / 4–20 mA), 1 × analog output (0–10 V / 4–20 mA) — onboard
- Program Memory: 10 KB user program + 10 KB data memory
- Data Memory: 10 KB
- Communication Port 1: RS-232 (Channel 0) — DF1, DH-485, Modbus RTU, ASCII
- Communication Port 2: RS-232 / RS-485 (Channel 1) — DF1, DH-485, Modbus RTU
- Ethernet Port: 10/100 Mbps EtherNet/IP (RJ-45)
- Real-Time Clock: Yes (battery-backed)
- LCD Display: Built-in 4-line × 20-character operator panel
- High-Speed Counter: Up to 6 HSC channels, 100 kHz max
- PTO / PWM: 2 × Pulse Train Output / Pulse Width Modulation channels
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5 % to 95 % (non-condensing)
- Enclosure Rating: IP20 (panel-mount)
- Mounting: DIN rail or panel mount
- Dimensions (W × H × D): 178 mm × 90 mm × 87 mm (approx.)
- Weight: ~800 g
- Certifications: UL, CE, RCM, cUL
- Programming Software: RSLogix 500 / Studio 5000 Logix Designer (via RSLogix 500)
Proven Application Environments
- Conveyor and material handling systems requiring distributed I/O and EtherNet/IP supervisory control
- Packaging machinery with high-speed counter inputs for encoder feedback and PTO stepper/servo indexing
- HVAC and building automation panels where Modbus RTU integration with third-party sensors is required
- Water and wastewater pump stations leveraging the built-in LCD for local status display without a separate HMI
- OEM machine retrofits replacing legacy MicroLogix 1100 / SLC 500 controllers with minimal rewiring
- Food and beverage lines requiring 24 V DC transistor outputs for hygienic solenoid valve control
Engineering Advantages
- Dual Serial + Ethernet: Three simultaneous communication channels allow concurrent SCADA polling, HMI connection, and peer-to-peer messaging without external switches or protocol converters.
- Onboard Analog I/O: Eliminates the cost and wiring complexity of a separate analog expansion module for single-loop PID or sensor monitoring applications.
- Built-in LCD Operator Panel: Supports custom message display and limited parameter entry directly on the controller — reducing BOM cost on simple standalone machines.
- High-Speed Counter / PTO: 100 kHz HSC inputs and native PTO outputs enable closed-loop positioning without a dedicated motion module.
- Battery-Backed RTC: Enables time-stamped event logging and scheduled recipe execution natively in ladder logic.
- Compact Footprint: 178 mm panel width accommodates tight enclosure layouts while delivering full-featured PLC capability.
System Architecture & Signal Flow
The 1766-L32BXBA operates as a standalone controller or as an EtherNet/IP adapter node within a Logix-based supervisory architecture. Signal flow is as follows:
- Field Inputs (DI 0–19): 24 V DC sink/source signals from sensors, pushbuttons, and proximity switches → onboard input image table → ladder logic scan
- Analog Inputs (AI 0–1): 0–10 V or 4–20 mA process signals → 12-bit ADC → N7/F8 data files for PID or scaling instructions
- Logic Execution: RSLogix 500 ladder program executes in a deterministic scan cycle; typical scan time 1–5 ms for 10 KB programs
- Analog Output (AO 0): Scaled integer → 12-bit DAC → 0–10 V or 4–20 mA control signal to VFD, valve positioner, or transmitter
- Digital Outputs (DO 0–11): Output image table → 24 V DC transistor drivers → solenoids, contactors, indicator lights
- EtherNet/IP: Explicit messaging (CIP) to SCADA / MES; implicit I/O connection to CompactLogix / ControlLogix as an adapter
- Serial Channels: DF1 full-duplex to RSLinx / RSLogix 500 for programming; Modbus RTU master/slave to third-party devices
Sourcing & Quality Verification
- All units sourced through verified industrial distribution channels with documented supply-chain traceability.
- Each controller undergoes incoming inspection: label authenticity check, firmware version verification, and functional power-on test prior to dispatch.
- Original Rockwell Automation catalog number and date-code markings are preserved and photographed for buyer records.
- Units are shipped in anti-static packaging with desiccant; ESD-safe handling throughout warehouse operations.
- Certificate of conformance and inspection report available upon request for MRO and OEM procurement teams.
Procurement Process
- Step 1 – Inquiry: Submit your BOM or catalog number to support@konmask.com or via the product page inquiry form.
- Step 2 – Quote: Receive a formal quotation with unit price, lead time, and shipping options within 1 business day.
- Step 3 – Order Confirmation: Purchase order or online checkout accepted; proforma invoice issued for wire-transfer orders.
- Step 4 – Inspection & Dispatch: Pre-shipment inspection completed; tracking number provided within 24–48 hours of payment clearance.
- Step 5 – After-Sales Support: Technical assistance available for installation, RSLogix 500 configuration, and warranty claims.
Technical FAQ
- Q: Is the 1766-L32BXBA compatible with Studio 5000 Logix Designer?
- A: No. The MicroLogix 1400 is programmed exclusively with RSLogix 500 (v8.0 or later). Studio 5000 is reserved for the Logix 5000 controller family (ControlLogix, CompactLogix).
- Q: Can I expand the I/O beyond the 32 onboard points?
- A: Yes. The 1766-L32BXBA supports up to 7 expansion modules via the 1762 MicroLogix Expansion I/O family, adding digital, analog, RTD, thermocouple, and specialty modules.
- Q: What is the maximum EtherNet/IP connection count?
- A: The controller supports up to 4 simultaneous EtherNet/IP connections (explicit + implicit combined).
- Q: Does the unit support Modbus TCP over Ethernet?
- A: No native Modbus TCP. Modbus RTU is supported on both serial channels (Channel 0 and Channel 1). Modbus TCP requires a third-party gateway.
- Q: What battery is used for the RTC and memory backup?
- A: Lithium coin cell, catalog number 1747-BA (3 V, CR2032 equivalent). Typical battery life is 5+ years under normal operating conditions.
- Q: Is this a new, refurbished, or surplus unit?
- A: Please confirm stock condition at time of inquiry. Konmask.com supplies new, tested-surplus, and factory-refurbished units depending on availability — all clearly labeled and priced accordingly.
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