1766-L32BWAA MicroLogix 1400 PLC Ethernet RS232 RS485 120V AC

1766-L32BWAA Allen-Bradley MicroLogix 1400 Controller

The 1766-L32BWAA is a MicroLogix 1400 programmable logic controller in the Bulletin 1766 family. It packs 38 I/O points, three communication ports, and a backlit LCD into one compact unit. Engineers pick the 1766-L32BWAA for mixed AC input and relay output panels that also need Ethernet and serial links. Core value: one controller covers discrete logic, analog signals, network messaging, and local status display.

Technical Specifications

• Brand: Allen-Bradley, Rockwell Automation
• Model / Catalog No.: 1766-L32BWAA
• Series: MicroLogix 1400, Bulletin 1766
• I/O count: 38 points total
• Digital inputs: 12 fast 24V DC plus 8 normal 24V DC
• Relay outputs: 12
• Analog I/O: 4 inputs and 2 outputs, 0-10V DC, 12-bit
• Input power: 110 to 240V AC, 47-63 Hz
• Power consumption: 120 VA
• Inrush current: 25A at 120V AC for 8 ms; 40A at 240V AC for 4 ms
• Memory: 20 KB, 10 KB user program plus 10 KB data, battery-backed RAM
• Communication ports: combo RS232/RS485 isolated, isolated RS232, Ethernet
• Serial protocols: DF1, ASCII, Modbus RTU, DNP3, DH485
• Ethernet protocols: EtherNet/IP, DNP3 over IP, Modbus TCP/IP
• High-speed counters: up to 6 embedded, 100 kHz
• Features: built-in RTC, backlit LCD, trim potentiometers, web server, email
• Expansion: up to 7 x 1762 I/O modules
• Mounting: DIN rail or panel
• Dimensions: 3.5 x 7.08 x 3.43 in
• Weight: 2 lb
• Certifications: UL, c-UL, CE

Installation Notes

• Use a clean, dry panel with Over-Voltage Category II circuits or lower.
• Feed 110-240V AC to the supply terminals and keep wiring away from analog lines.
• Fit the unit on DIN rail or bolt it to a panel with the open enclosure.
• Plan for 7 expansion modules and reserve rail space.
• Ground the chassis before power-up to reduce noise on analog inputs.

Commissioning and Diagnostics

• Read controller and I/O status on the backlit LCD during first power-up.
• Set network parameters through the LCD or the web server.
• Trim potentiometers simulate registers for analog tests.
• Use the real-time clock for time-stamped events and scheduled control.
• Watch for inrush peaks on shared 120V AC circuits during startup.
• Check Ethernet link LEDs and serial port activity when a protocol fails.

Compatibility and Fit

• Works with the 1762 expansion I/O family for extra points.
• Suits panels built around 24V DC sensors and 120V AC field devices.
• Fits retrofit jobs that replace older MicroLogix controllers.
• Good match for conveyors, mixers, pumps, and packaging lines.
• Fits water treatment, material handling, and OEM machine builds.

Oiltech Controls Review

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FAQ

• How many I/O points does the 1766-L32BWAA offer?
  It provides 38 points: 20 digital inputs, 12 relay outputs, and 6 analog channels.
• Can the 1766-L32BWAA run a DNP3 network?
  Yes. DNP3 works over serial ports and over Ethernet as DNP3 over IP.
• What should I check before buying a used MicroLogix 1400?
  Ask for the firmware revision, LCD condition, and port test results. Request a photo of the nameplate to confirm the catalog number.
• Does this controller support analog control without extra modules?
  Yes. It has 4 analog inputs and 2 analog outputs at 12-bit, all 0-10V DC.
• How do I choose between this model and a higher I/O controller?
  Pick this model when 38 points and 7 expansions are enough. Move up when you need more memory or faster scan times.

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