1790D-N0C2 Allen-Bradley 2-Channel Analog Output Module

1790D-N0C2 2-channel Analog Current Output Module by Allen-Bradley

Key Technical Specifications

• Brand & Series: Allen‑Bradley CompactBlock LDX series – model 1790D-N0C2.
• Output Channels: Two single‑ended, non‑isolated channels; each configurable for 0…20 mA current loops.
• Resolution & Data: 12‑bit resolution (4.88 µA/bit) with binary data format from 0000 to 0FFF (max scale).
• Accuracy & Speed: Overall accuracy ±0.2 % full scale @ 0…55 °C; conversion time only 2 ms per channel.
• Load & Isolation: Supports external load up to 600 Ω; 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: Two red/green I/O status LEDs; connection via 37‑pin D‑shell female connector.
• Expansion Capability: This analog base module accepts up to two discrete expansion modules directly.

Mechanical & Environmental Highlights

• Insulation Resistance: Minimum 20 MΩ at 250 V DC between insulated circuits ensures reliable isolation.
• Temperature Range: Rated for operation 0…55 °C with full accuracy; suitable for industrial control cabinets.
• Non‑Isolated Sections: DeviceNet to logic and field power are non‑isolated – refer to wiring manual for proper grounding.
• Compact Design: Saves panel space while offering two high‑resolution analog outputs and expansion flexibility.

Frequently Asked Questions (FAQ)

• Does the 1790D-N0C2 require calibration before use? No, the module needs no field calibration – it ships factory‑calibrated and maintains 0.2 % accuracy over 0…55 °C.
• What maximum load resistance can I connect to each output? You can connect up to 600 Ω external load per channel while maintaining full 0…20 mA output.
• Can I use this module with both 0…20 mA and 4…20 mA devices? Yes, the hardware outputs 0…20 mA, so you can scale your program to utilize any subset like 4…20 mA.
• Is the 1790D-N0C2 isolated from the network side? I/O to logic uses photocoupler isolation (1250 V AC), but DeviceNet to logic is non‑isolated – observe system grounding.
• How many expansion modules can I attach? This analog base supports a maximum of two discrete expansion modules – ideal for mixed I/O needs.
• What is the typical conversion time for both channels? The module updates each channel in 2 ms, so total cycle time for both channels is 4 ms.

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