Application Scenarios
Consider a regional beverage bottler running 14 identical syrup-blending skids across three facilities. Each skid needs only a handful of level, flow, and valve inputs, a dozen relay outputs for pump starters and solenoid valves, and a modest HMI touch panel — but every skid also has to report production counters to the plant SCADA over EtherNet/IP. Instead of deploying rack-based controllers at roughly three times the hardware cost, the integrator standardised on the 1766-L32AWA with a single 1762 analog expansion per skid, connected the embedded Ethernet port directly to the plant network, and mounted a low-cost HMI on the same switch. The project team later noted that the built-in LCD proved unexpectedly valuable during commissioning, allowing technicians to verify I/O states on the skid without connecting a laptop.
The controller addresses three chronic pain points in small-to-medium machine automation: (1) the cost and complexity penalty of deploying rack-based PLCs where a fixed-I/O brick would suffice, (2) the historically weak networking options of micro-PLCs that forced integrators into serial-only architectures, and (3) the difficulty of local troubleshooting on machines that ship to sites without engineering staff. Because the 1766-L32AWA carries native EtherNet/IP with web-server and e-mail capability, full DNP3 / Modbus TCP / DF1 / DH-485 protocol support, and an operator-facing LCD on the front panel, it closes each of those gaps within a single catalog number.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1766-L32AWA |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Fixed-I/O Compact PLC (MicroLogix 1400, Bulletin 1766) |
| Embedded Digital I/O | 20 × 120 V AC inputs (79–132 VAC on-state) + 12 × relay outputs (2.5 A per channel) |
| User Memory | 20 KB total (10 KB user program + 10 KB user data) |
| Data Logging / Recipe Storage | 128 KB data logging; 64 KB recipe (drawn from logging pool) |
| Communication Ports | 1 × EtherNet/IP RJ-45 (10/100 Mbps); 1 × isolated RS-232/RS-485 mini-DIN (Port 0); 1 × non-isolated RS-232 D-sub (Port 2) |
| Supported Protocols | DF1, DH-485, Modbus RTU, Modbus TCP/IP, DNP3, DNP3 over IP, ASCII, EtherNet/IP messaging |
| Supply Voltage | 100–240 V AC @ 47–63 Hz; 100 VA consumption; inrush 25 A / 8 ms @ 120 V, 40 A / 4 ms @ 240 V |
| Expansion Capacity | Up to seven 1762 expansion I/O modules, 256 discrete I/O total |
| Display & Keypad | Backlit monochrome LCD, 6-key keypad (ESC / OK / Up / Down / Left / Right) |
| Dimensions & Weight | 90 × 180 × 87 mm (3.5 × 7.087 × 3.43 in); shipping weight 0.9 kg (2.0 lb) |
| Operating Environment | –20 °C to +60 °C; 5–95 % RH non-condensing; Pollution Degree 2; altitude ≤ 2000 m |
| Certifications | UL Listed Class I Div 2 Groups A/B/C/D (Temp Code T3C), CE, Australian RCM, ABS, Bureau Veritas, EAC |
