Model Number Breakdown:

• ANB10D: 10-channel analog input, DCS-compatible
• 420: Input range 4–20 mA DC
• CU2T: Copper screw terminal connection type
• NDEL: No delay (fast update, non-filtered) mode

Key Specifications:

• Number of Channels: 10 channels (single-ended or differential selectable)
• Input Signal: 4–20 mA DC (2-wire transmitter powered)
• Input Impedance: 250 Ω (burden voltage ≤ 5 V at 20 mA)
• Resolution: 16-bit A/D converter (65,536 steps)
• Conversion Time: 1 ms per channel (NDEL mode)
• Accuracy: ±0.1% of span (at 25 °C)
• Common Mode Rejection Ratio (CMRR): ≥ 120 dB (at 50/60 Hz)
• Isolation Voltage: 1500 V AC between channels and between channels and bus
• Communication: F Fieldbus H1 (31.25 kbps) / Modbus RTU (RS-485)
• Power Consumption: ≤ 3.5 W per module

Functional Features:

• Channel-by-Channel Configuration: Each of the 10 channels can be independently configured for input range, filtering, and alarm limits
• Fail-Safe Output: Configurable high/low/hold-last behavior on communication failure
• Burnout Detection: Detects open circuit (> 22 mA) and short circuit (< 3.8 mA) conditions
• Self-Diagnosis: Continuous monitoring of A/D converter, communication, and internal circuitry
• LED Indicators: Per-channel green (normal) and red (alarm/fault) status LEDs

Material Composition:

• Housing: Glass-fiber reinforced PBT plastic (UL94 V-0, flame retardant)
• Terminal Blocks: Copper alloy with tin plating (CU2T specification)
• PCB: FR-4 epoxy glass with conformal coating
• Connector: F Fieldbus H1 connector (9-pin D-sub, shielded)

Structural Characteristics:

• Form Factor: DIN rail-mountable, 16 mm width per module slot
• Dimensions: 129.5 mm (W) × 130 mm (H) × 120 mm (D) (approximate, including terminals)
• Weight: Approximately 0.45 kg

Operating Principle:
Each input channel receives a 4–20 mA current signal from a field transmitter. The current flows through a precision 250 Ω burden resistor, generating a 1–5 V voltage proportional to the input. This voltage is fed into a 16-bit successive approximation A/D converter. The digital value is then packaged into F Fieldbus function blocks or Modbus registers and transmitted to the DCS controller. In NDEL mode, the conversion result is transmitted immediately without software filtering, enabling fast process response.

Advantages & Highlights:

• High-Speed Scanning: NDEL mode provides 1 ms update rate per channel — ideal for fast-response processes
• Wide CMRR: ≥ 120 dB rejection of common-mode noise ensures signal integrity in electrically noisy environments
• Robust Isolation: 1500 V AC isolation protects the DCS from field-side transients
• Flexible Wiring: CU2T copper terminal block allows secure, tool-free wiring in the field

Applicable Industries:

• Chemical Processing
• Oil & Gas Production
• Power Generation (Boiler/Turbine Control)
• Pharmaceutical Manufacturing
• Pulp & Paper

Installation Requirements:

• Install in a DIN rail enclosure with adequate ventilation; maintain ambient temperature 0 to 55 °C
• Use shielded twisted-pair cable for all 4–20 mA input signals; connect shield to chassis ground at one end only
• Maximum cable length from transmitter: 1000 m (depending on wire gauge and load)
• Ensure 24 V DC loop power supply is available for 2-wire transmitters (≤ 5 V burden)

Usage Precautions:

• Do not exceed 30 V DC across any input channel (including transient spikes)
• Verify transmitter is 2-wire, loop-powered (4–20 mA) type; 4-wire transmitters require external power
• Do not mix input types (e.g., mA and mV) on the same module — use dedicated modules per signal type
• Periodically verify terminal screw torque: 0.5–0.8 N·m