Allen-Bradley 1734-ACNR Point IO Analog Input Module

The Allen-Bradley 1734-ACNR is a POINT I/O ControlNet adapter that bridges a ControlNet network to a POINT I/O rack, serving as the communication interface between a controller and attached I/O modules in a POINT I/O system. It is a single-node ControlNet interface (max 1 node) that facilitates data exchange with POINT I/O modules, including both analog and digital I/O, over the ControlNet network, and it requires a 24V DC field supply.

Key electrical and data‑path specs include a field power bus voltage of 24V DC (range 10–28.8V DC), a typical field power bus current rating up to 10 A, and a power consumption of up to 8.1 W at 28.8V DC. The adapter presents an input byte capacity of 248 bytes and an output byte capacity of 248 bytes, supporting data rates up to 128K bit/s at 500 m, 250K bit/s at 250 m, or 500K bit/s at 100 m, depending on distance. Power for the ControlNet side is typically 24V DC at about 400 mA (plus tolerance), with wiring recommendations specifying 0.25–2.5 mm² conductors and shielded copper wire rated to at least 75 °C. The device uses the PointBus to connect to I/O modules and is identified in Rockwell/POINT I/O literature as Series A, with isolation ratings suitable for basic insulation between circuits.

Typical applications include ControlNet-based POINT I/O installations where a central controller reads and writes to analog input modules and other I/O within a POINT I/O rack, enabling deterministic, real-time I/O data transfer for industrial automation, process control, and machine automation environments.