Allen-Bradley 1761-L16NWB MicroLogix 1000 Programmable Controller

The 1761-L16NWB is a compact programmable logic controller belonging to the Allen-Bradley MicroLogix 1000 series. Designed for small-scale automation tasks, this controller features 16 embedded I/O points and operates on a 24 VDC power supply. It combines robust processing capabilities with versatile AC/DC input configurations and relay outputs, offering a reliable, cost-effective automation solution for discrete machine control environments.

I/O Configuration and Power Specifications

The controller features a total of 16 integrated I/O points, comprising 10 digital inputs and 6 relay outputs. The digital inputs support both 24 VAC or 24 VDC excitation voltages, providing flexibility in mixed-signal panel wiring. Powered by 24 VDC, the unit incorporates internal connections between the user-supplied input power ground and chassis ground.

Processing and Memory Performance

Equipped with a built-in EEPROM memory module, the unit securely retains ladder logic and user data without requiring an external battery backup. It delivers efficient program execution speeds, utilizing a 1K-word memory capacity optimized for handling standard logic instructions, timers, and counters in compact automation setups.

Communication and System Integration

Featuring an integrated RS-232C communication port, the controller supports standard industrial protocols including DF1 full-duplex, half-duplex DF1 master/slave, and DH-485. This allows seamless connection to programming software, operator interfaces, and higher-level networks through optional network interface modules.

Technical Parameters

Frequently Asked Questions

Q: Can the 1761-L16NWB digital inputs accept both AC and DC signals? A: Yes, the 10 digital inputs are designed to accept either 24 VAC or 24 VDC excitation voltages, offering high adaptability for various field device types.

Q: Does this controller require a physical battery for program backup? A: No, the unit utilizes built-in EEPROM memory, which permanently retains user programs and data without requiring a replacement battery or external memory module.

Q: What communication protocols are supported by the built-in port?A: The integrated RS-232C port supports DF1 protocol, DH-485, and point-to-point communication for device programming and networking.