The Omron NX-AD4204, also cataloged as the NX-AD4204 Analog Input Unit, operates as a dedicated hardware component for multi-channel current signal conversion within NX Bus industrial automation platforms.

Model Matrix & Signal Conversion

The unit processes up to 8 analog input points over a 4 to 20 mA direct current loop using a differential input wiring configuration. Hardware logic scales current signals to a 1/8000 digital resolution, mapping 0 to 100% process variables to decimal values from 0 to 8000. Signal conversion executes at 250 us per point with Free-Run backplane refreshing across an input impedance of 85 ohm.

Hardware Specifications

Backplane Bus & Network Synchronization

Backplane bus communication velocity and I/O density scaling maintain real-time data transfer across all 8 current loops without introducing scan delays. Deterministic communication over EtherNet/IP and EtherCAT fieldbus couplers ensures continuous synchronicity with primary control loops. Firmware flash compatibility ensures long-term operational stability and seamless integration into system software revisions.

Ordering Information

• 1 x Omron NX-AD4204 Analog Input Unit
• 1 x Push-In Plus Terminal Assembly Block
• 1 x Module Installation Leaflet

Field Installation & Wiring Guidelines

• Mount the module vertically onto a standard 35 mm DIN rail inside a protective industrial panel enclosure.
• Connect 4 to 20 mA loop conductors using twisted-pair shielded cables to suppress electromagnetic interference on differential input lines.
• Maintain separate wire ducts for analog signal lines away from high-voltage AC power and motor drive cabling.
• Earth the DIN rail and cable shield drain wires directly to the main enclosure grounding point.

Frequently Asked Questions

• Q: What input signal range is accepted across the analog channels?

  A: The module accepts standard 4 to 20 mA direct current signals across all 8 differential input channels.

• Q: What is the full-scale conversion resolution for current measurement?

  A: The internal analog-to-digital converter provides a 1/8000 resolution corresponding to decimal values 0 to 8000.

• Q: What input method is used across field terminal connections?

  A: The hardware utilizes a differential input wiring configuration to isolate signal lines from common-mode voltage.

• Q: What conversion speed does the module achieve per channel?

  A: Signal conversion executes at a speed of 250 us per point under Free-Run backplane refreshing.

• Q: What is the input impedance across current measurement terminals?

  A: Internal input impedance measures 85 ohm across the current loop terminals.

• Q: What overall accuracy is guaranteed at 25 deg C ambient temperature?

  A: Measurement overall accuracy is +/-0.2% of full scale at an ambient temperature of 25 deg C.

• Q: How is electrical power supplied to the input circuitry?

  A: Internal logic power is supplied directly through the internal backplane bus interface of the base rack.

• Q: What is the gross shipping weight for logistics calculations?

  A: The net weight of the module is 0.070 Kg, while the complete packaged shipping weight is 2 Kg.