1766-L32BXB Allen-Bradley MicroLogix 1400 Controller
The 1766-L32BXB is a 32-point controller in the Allen-Bradley MicroLogix 1400 family. It packs three communication ports, mixed discrete I/O, a backlit LCD, and a real-time clock in one compact housing. Engineers pick it for panels that need Ethernet plus serial links at the same time. It runs on 24V DC and mounts on a panel or DIN rail.
Technical Snapshot
- Model: 1766-L32BXB, Bulletin 1766 family
- I/O: 32 points total
- Inputs: 12 fast 24V DC, 8 normal 24V DC
- Outputs: 6 relay, 3 fast 24V DC, 3 normal 24V DC
- Memory: 20 KB (10 KB program, 10 KB data)
- Power: 24V DC, 50W draw, 15 A inrush for 20 ms
- Frequency: 47–63 Hz operating range
- RTC: built-in, battery-backed RAM
- Dimensions: 90 x 180 x 87 mm
- Weight: 2 lbs
- UPC: 10612598518118
Communication and Protocols
- Port 1: combo RS232 / RS485, isolated
- Port 2: isolated RS232
- Port 3: Ethernet with EtherNet/IP
- Serial: DF1, ASCII, Modbus RTU, DNP3, DH485
- Ethernet: EtherNet/IP, DNP3, Modbus TCP/IP
- Email messaging over Ethernet
High-Speed and Motion Features
- Up to 6 high-speed counters at 100 kHz
- Pulse Train Output (PTO) at 100 kHz
- Pulse Width Modulation (PWM) at 40 kHz
- Online editing with the built-in LCD
- Recipe and log data support
Where It Fits
- HVAC and building management panels
- Water and wastewater treatment skids
- Facilities management systems (FMS)
- Counting, totalizing, and simple motion axes
- Mixed-voltage panels needing relay plus DC outputs
- Retrofit of 1762 expansion I/O racks
Oiltech Controls Review
The 1766-L32BXB still earns its place in legacy panels. The three-port layout removes the need for extra gateways. The built-in RTC covers time-based switching without add-on cards. Mixed relay and DC outputs cut wiring work. Our bench check confirms port function, I/O response, and RTC hold-up before shipment. For plants keeping MicroLogix 1400 lines alive, this unit is a practical drop-in.
Oiltech Controls’s Insight
- Check backplane power budget before adding 1762 I/O
- Use the isolated RS485 port for long Modbus runs
- Keep the open enclosure in clean, dry, OVC II areas
- Back up the 10 KB program before swapping hardware
- Confirm firmware revision for DNP3 features
Warranty and Dispatch
- 12-month warranty on every controller
- Dispatch in 24–28 hours after order confirmation
- Shipping by FedEx, UPS, and DHL
- Tracking number sent on dispatch
- Technical check before packing
Professional FAQ
Q: Can I swap a 1766-L32BWA for the 1766-L32BXB?
A: Check the output mix first. The BXB adds fast DC outputs and Ethernet DNP3 support. Verify your program uses the BXB catalog number before power-up.
Q: Does the built-in RTC need a battery change?
A: Yes, over time. The battery backs RAM and clock. Replace it during planned downtime and re-check time-based routines after the swap.
Q: Which port should I use for Modbus RTU?
A: Use the isolated RS485 channel for long cable runs. Keep the non-isolated RS232 port for short local links such as a PC or HMI.
Q: How do I pick between relay and DC outputs on this unit?
A: Relay outputs suit mixed AC/DC loads and higher inrush. Fast DC outputs suit high-speed switching and pulse work. Match the load type to the terminal group.
Q: What should I check before buying a used 1766-L32BXB?
A: Ask for port test results, RTC hold-up check, and I/O verification. Confirm firmware revision and LCD backlight condition. Request the test record with the shipment.
Contact
Email: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
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