1790D-N4C0 Allen-Bradley 4-Channel Analog Current Input Module

1790D-N4C0 4‑channel Analog Current Input Module by Allen‑Bradley

Key Technical Specifications

• Brand & Series: Allen‑Bradley CompactBlock LDX series – model 1790D-N4C0 analog input module.
• Input Channels: Four single‑ended, non‑isolated channels; software‑configurable for 4…20 mA (default) or 0…20 mA.
• Resolution & Data: 12‑bit unipolar resolution (3.90 µA/bit for 4…20 mA, 4.88 µA/bit for 0…20 mA) with binary data format 0000 to 0FFF.
• Accuracy & Speed: Overall accuracy ±0.2 % full scale @ 0…55 °C; conversion time 10 ms per channel (40 ms for all four).
• Input Impedance & Isolation: 249 Ω input impedance; photocoupler isolation between I/O and logic (1250 V AC rms tested).
• Power Requirements: DeviceNet supply 24 V DC nom (11…28.8 V DC, 1.2 W max); field power 24 V DC nom (21.6…26.4 V DC, 1.5 W max).
• Indicators & Wiring: Four red/green I/O status LEDs; connection via 37‑pin D‑shell female connector.
• Expansion Capability: This analog base module supports up to two discrete expansion modules directly attached.

Mechanical & Environmental Features

• Insulation Resistance: Minimum 20 MΩ at 250 V DC between insulated circuits ensures stable isolation.
• Temperature Range: Full accuracy from 0…55 °C makes it suitable for industrial cabinet environments.
• Non‑Isolated Sections: DeviceNet to logic and field power are non‑isolated – follow proper grounding practices.
• Space‑Saving Design: Four high‑resolution inputs in one housing with expansion capability reduces panel footprint.

Frequently Asked Questions (FAQ)

• Does the 1790D-N4C0 support both 4…20mA and 0…20mA inputs? Yes, you can configure each channel via software for either 4…20 mA (default) or 0…20 mA range.
• What is the input impedance of each channel? Each analog input presents 249 Ω to the loop – compatible with most transmitters.
• How fast does the module read all four channels? Conversion takes 10 ms per channel, so a complete scan of four inputs requires 40 ms.
• Is field calibration required for the 1790D-N4C0? No calibration needed – the module ships factory‑calibrated and maintains accuracy over temperature.
• Can I add expansion modules to this analog base? Yes, you can attach up to two discrete expansion modules directly to this base unit.
• What isolation does the module provide? Photocoupler isolation between I/O and logic (1250 V AC), but DeviceNet and field power are non‑isolated.

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