1762-L40AWA Allen-Bradley MicroLogix 1200 Controller 24 In 16 Relay

1762-L40AWA: 40-Channel MicroLogix 1200 Controller

The Allen-Bradley 1762-L40AWA is a MicroLogix 1200 programmable controller with 24 AC inputs and 16 relay outputs. It runs on 120/240V AC and handles up to 1440 VA of load. Two front-panel trim potentiometers allow local register simulation. One 8-pin mini-DIN port covers DF1, DH-485, ASCII, and MODBUS. This unit suits panel builders who need a compact, self-contained PLC with embedded I/O.

Specification Breakdown

• Catalog No: 1762-L40AWA | Brand: Allen-Bradley | Series: MicroLogix 1200
• Input power: 120–240V AC, 47–63 Hz, 82 VA
• Inputs: 24 x 120V AC
• Outputs: 16 x relay, 24–125V DC / 120–240V AC
• Load current: 10A minimum, 8A per group common
• Inrush: 25A for 8 ms at 120V AC; 40A for 4 ms at 240V AC
• On-state voltage: 14–24V DC (inputs 0–3), 10–24V DC (inputs 4+)
• Off-state voltage: 0–5V DC; leakage 1.5 mA minimum
• Mechanical cycles: 20,000,000
• Port: 1 x 8-pin mini-DIN serial
• Protocols: DF1, DH-485, ASCII, MODBUS master/slave
• Dimensions: 90 mm H (104 mm with DIN latch open) x 160 mm W x 87 mm D
• Operating temp: 0 to 55 °C | Shipping weight: 2.4 lb

Oiltech Controls Review: Panel-Level Notes

• Relay outputs switch both DC and AC loads, so one model covers mixed panels.
• 8A per group common is the hard limit; split loads across commons.
• Two separate on-state windows exist: 14–24V DC for inputs 0–3, 10–24V DC above.
• Trim pots allow setpoint tweaks without a programming terminal.
• MODBUS master/slave support links the PLC to drives and HMIs directly.
• 82 VA supply draw matters when sizing upstream transformers.

Wiring and Commissioning

• Feed 120/240V AC at 47–63 Hz; confirm 82 VA supply capacity.
• Land field wiring on screw terminals; keep AC input runs short.
• Check 8A per group common before energizing outputs.
• Adjust trim pots with a precision screwdriver only.
• Download programs through the 8-pin mini-DIN port.

FAQ

Q: Can the relay outputs switch DC coils and AC contactors on the same unit?

A: Yes. The relay contacts are rated 24–125V DC and 120–240V AC, so mixed loads are fine.

Q: What happens if I exceed 8A on one group common?

A: You risk module damage. Split the load across group commons or add an interposing relay.

Q: Do all 24 inputs share the same on-state voltage?

A: No. Inputs 0–3 need 14–24V DC; inputs 4 and above accept 10–24V DC.

Q: How do I connect to an HMI or SCADA system?

A: Use the 8-pin mini-DIN port with DF1, DH-485, ASCII, or MODBUS.

Q: What should I verify before buying a surplus 1762-L40AWA?

A: Confirm all 24 inputs and 16 relays test good, check the serial port, and inspect the DIN latch. Oiltech runs these checks before dispatch.