### Product Overview: OMRON Analog Input Unit (Current Input Type) – Model NX-AD4204

The OMRON NX-AD4204 is a high-performance analog input unit designed for current-based signal acquisition within the NX-series machine automation controller system. Specifically configured for current input, this module provides precise and reliable measurement of process signals, making it ideal for industrial applications requiring accurate monitoring of sensors, transmitters, and other 4–20 mA devices.

Key Specifications & Features:

●Input Points: 8 differential input channels, enabling simultaneous measurement of multiple signals with reduced electrical noise interference.

●Input Range: Standard 4–20 mA current loop, widely used in industrial process control environments.

●Resolution: 1/8,000 (8000 divisions) for high-resolution signal conversion, ensuring fine detail in measurement.

●Converted Value (0–100%): Digital output range of 0 to 8000 (decimal), corresponding linearly to the 4–20 mA input span.

●Accuracy: ±0.2% of full scale (at 25°C), offering reliable and repeatable measurements under normal ambient conditions.

●Input Method: Differential input configuration improves noise immunity by rejecting common-mode interference.

●Conversion Time: Ultra-fast 250 µs per point, allowing rapid signal acquisition suitable for high-speed control loops.

●Input Impedance: 250 Ω, matching standard 4–20 mA loop requirements.

●I/O Refresh Method: Free-run mode continuously updates input data without synchronization to a fixed cycle, providing flexible and low-latency access to process values.

●Direct Use: Not supported. The unit requires configuration and mapping via an NX bus coupler or controller, meaning it cannot be used as a standalone module without proper system integration.

Applications:

The NX-AD4204 is perfectly suited for use in factory automation, process monitoring, condition monitoring, and any system where multiple 4–20 mA current signals need to be converted accurately and quickly into digital data for PLC or PC-based control. Its differential input design and fast conversion rate make it especially effective in electrically noisy industrial environments.