Model: 1766-L32BXB
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Datasheet Preview
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Commercial Path
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Technical Dossier
The Allen-Bradley MicroLogix 1400 series, manufactured by Rockwell Automation, is a compact programmable logic controller platform deployed extensively across global heavy industry. Installations span petrochemical processing plants, oil refineries, water treatment facilities, pulp and paper mills, and discrete manufacturing lines. The series occupies a defined position in Rockwell's small controller hierarchy — above the MicroLogix 1100 and below the CompactLogix L1/L2 range — providing a balance of onboard I/O density, embedded communication ports, and real-time analog processing capability that made it a standard specification in projects from the mid-2000s through the 2010s. Its installed base remains substantial, with active units operating in facilities across North America, Europe, Southeast Asia, and the Middle East.
The MicroLogix 1400 platform (catalog prefix 1766) was introduced by Rockwell Automation as a successor to the MicroLogix 1200 (1762 series), addressing demand for higher onboard I/O counts, embedded Ethernet/IP, and expanded analog capability in a DIN-rail-mountable form factor. Early production units shipped with firmware supporting ladder logic and function block diagram (FBD) execution. Subsequent firmware revisions added structured text support, enhanced PID loop management, and expanded data logging to onboard flash memory.
The architecture centers on a fixed I/O base controller with no expansion backplane — expansion is achieved via the 1762 expansion I/O bus, maintaining backward compatibility with MicroLogix 1200 expansion modules. This cross-series compatibility was a deliberate design decision that extended the platform's serviceability window. Communication options evolved from RS-232/RS-485 (DF1, DH-485, Modbus RTU) in early units to include embedded 10/100 Ethernet/IP in all 1766 controllers, enabling integration with modern SCADA and MES systems without additional communication modules. As of 2024, the MicroLogix 1400 series has entered the end-of-life phase under Rockwell's lifecycle policy, with recommended migration paths to the Micro820 (2080 series) or CompactLogix 5380 platforms. This transition makes long-term spare parts availability a critical operational concern for facilities maintaining existing 1766 installations.
The following SKUs represent the verified MicroLogix 1400 (1766) controller range and associated 1762 expansion I/O modules confirmed for use with this platform. Each entry reflects a distinct catalog number with defined I/O configuration and communication capability.
Controllers — 1766 Series (MicroLogix 1400 Base Units)
1766-L32BXB: 24VDC input, 24VDC/relay output, 32-point onboard I/O, embedded Ethernet/IP, RS-232, RS-485, 10 analog I/O channels, Series B revision with enhanced data logging and Modbus TCP support.
1766-L32AWA: 120/240VAC power supply, 24VDC digital inputs, relay outputs, 32-point onboard I/O, embedded Ethernet/IP and dual serial ports, standard analog I/O complement.
1766-L32BXBA: 24VDC powered variant of L32BXB with additional onboard analog expansion; Series B architecture with full Ethernet/IP and Modbus TCP.
1766-L32AWAA: AC-powered controller with relay outputs, 32 onboard I/O points, dual serial ports, embedded Ethernet/IP, Series A revision.
1766-L32BWAA: 24VDC input power, relay digital outputs, 32-point I/O, embedded Ethernet/IP, RS-232/RS-485 serial, Series A.
1766-L32BWA: 24VDC powered, relay output configuration, 32-point onboard I/O, standard Ethernet/IP and serial communication suite.
Expansion I/O Modules — 1762 Series (Compatible with MicroLogix 1400)
1762-IA8: 8-point 120VAC digital input expansion module; screw terminal wiring; DIN-rail mount; extends controller digital input capacity.
1762-IQ8: 8-point 24VDC digital input expansion module; sink/source configurable; standard 1762 bus interface.
1762-IQ16: 16-point 24VDC digital input module; high-density discrete input expansion for the 1766 platform.
1762-OA8: 8-point 120/240VAC digital output expansion module; triac output type; suitable for AC load switching applications.
1762-OB8: 8-point 24VDC sourcing digital output module; solid-state transistor outputs; 1762 bus compatible.
1762-OB16: 16-point 24VDC sourcing digital output expansion; high-density discrete output for the MicroLogix 1400 system.
1762-OW8: 8-point relay output expansion module; Form C contacts; suitable for mixed AC/DC load control.
1762-IF4: 4-channel analog input module; 0–10V / 4–20mA selectable per channel; 12-bit resolution; 1762 bus interface.
1762-OF4: 4-channel analog output module; 0–10V / 4–20mA output per channel; 12-bit resolution; integrates with MicroLogix 1400 PID loops.
1762-IF2OF2: Combination 2-channel analog input / 2-channel analog output module; compact mixed analog I/O expansion for space-constrained panels.
1762-IQ8OW6I: Combination 8-point 24VDC digital input / 6-point relay output module; isolated relay contacts; reduces module count in mixed I/O applications.
1762-IT4: 4-channel thermocouple/mV input module; supports J, K, T, E, R, S, B type thermocouples; 16-bit resolution; cold junction compensation onboard.
1762-IR4: 4-channel RTD input module; supports Pt100, Pt1000, Ni120 RTD types; 16-bit resolution; for precision temperature measurement loops.
1762-NC4: 4-channel NTC thermistor input module; supports standard NTC curves; used in HVAC and refrigeration control applications.
1762-IQ32T: 32-point 24VDC digital input module; high-density discrete input expansion; terminal block wiring; maximum I/O density configuration for the 1766 platform.
MicroLogix 1400 controllers and 1762 expansion modules present specific verification requirements due to their embedded communication hardware, onboard flash memory, and analog signal conditioning circuits. DriveKNMS applies a structured inspection and functional test protocol to all 1766 and 1762 units processed through its facility.
Physical inspection covers catalog label verification (catalog number, series letter, firmware revision sticker), connector integrity on the 1762 expansion bus port, RS-232/RS-485 terminal block condition, and Ethernet RJ-45 port pin continuity. Functional testing includes power-on self-test (POST) verification, communication port enumeration via RSLinx Classic, Ethernet/IP node discovery, and where applicable, analog I/O channel calibration verification against factory specification. Units exhibiting non-standard firmware versions, evidence of field modification, or communication port faults are quarantined and not dispatched. All tested units are shipped with a DriveKNMS inspection record documenting test date, technician ID, and pass criteria results.
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