Allen Bradley 1746-NIO4I Key features
Multiple signal types support: compatible with thermocouples, RTDs, voltage and current inputs, covering mainstream industrial sensor interfaces.
Hot-swappable and maintenance-friendly: Allen Bradley 1746-NIO4I supports hot-swap, no need to power off when replacing modules, reducing downtime; equipped with status indicator lights for quick fault diagnosis.
Flexible input configuration: Allen Bradley 1746-NIO4I each channel can be independently set to thermocouple, RTD or voltage/current input, adapting to the scenario of mixed deployment of multiple types of sensors.
Backplane integration: directly plug into the PLC-5 controller rack, communicate with the controller through the backplane bus, and simplify wiring.
Comparison with Other Models and Substitute Feasibility Analysis
Model | 1746-NIO4I | 1746-NIO4V | 1746-NI4 |
Input Types | Thermocouples, RTDs, voltage, current | Voltage only (±10V, etc.) | Current only (4-20mA, etc.) |
Number of Channels | 4 | 4 | 4 |
Isolation Voltage | Channel-to-channel: ≥1500V DC; Module-to-backplane: ≥500V DC | Same as NIO4I | Same as NIO4I |
Applicable Scenarios | Mixed sensor types (temperature, pressure, current) | Voltage signals only (e.g., instrument outputs) | Current signals only (e.g., 4-20mA transmitters) |
Substitutability | Fully replaces single-type modules (more versatile) | Not replaceable by NIO4I (limited functionality) | Not replaceable by NIO4I (limited functionality) |
Summary：1746-NIO4I is a general-purpose analog input module, suitable for scenarios requiring simultaneous acquisition of multiple signal types (e.g., temperature + pressure + current). If the project only requires a single signal type, dedicated modules (NIO4V/NI4) can reduce costs but with reduced flexibility.
