Overview

The IF4IH is a four-channel, isolated module that allows each channel to be independently configured for current, voltage, or current with HART communication. It digitally converts and stores analog data from these configurations, as well as HART data for channels configured with HART. Each input channel can be configured via software for a specific input device, data format, and filter frequency, providing over-range and under-range detection and indication.

Specifications

• Configuration

  • 4 isolated channels of current/voltage inputs with an ADC per channel
  • HART communication on channels configured for HART

• Input Types

  • Normal Range:
    • Voltage: ±10 V, 0–10 V, 0–5 V, 1-5 V
    • Current: 0–20 mA, 4–20 mA
  • Full Range:
    • Voltage: ±10.5 V, -0.5–10.5 V, -0.5–5.25 V, 0.5-5.25 V
    • Current: 0–21 mA, 3.2–21 mA

• Fault Detection

  • Over-range and under-range error bits
  • Open-circuit detection for 4-20 mA and all voltage ranges

• Input Impedance

  • Voltage Terminal: >1 MΩ (nominal)
  • Current Terminal: 249 Ω (nominal)

• Overall Accuracy

  • Voltage Inputs:
    • ±0.2% of full scale at 25 °C
    • ±0.3% of full scale at 0-60 °C
  • Current Inputs:
    • ±0.35% of full scale at 25 °C
    • ±0.5% of full scale at 0-60 °C

• Accuracy Drift

  • Voltage Inputs: ±0.003%/°C
  • Current Inputs: ±0.0045%/°C

• Data Formats

  • Engineering units, Scaled for PID, Percent of Full Scale, RAW/Proportional counts

• Input Filter

  • 28.5 Hz, 50 Hz, 60 Hz, 300 Hz, 360 Hz

• Channel Update Time

  • Minimum Update Time: 10 ms with 360 Hz filter
  • Maximum Update Time: 108 ms with 28.5 Hz filter

• Isolation

  • Channel to Rack: 710 VDC or 500 VAC for one minute (Optical and magnetic)
  • Channel to Channel: 710 VDC or 500 VAC for one minute (Optical and magnetic)

• Isolation Spacing Requirements

  • PCB Spacing: 0.033 in. (0.85 mm)
  • Non-PCB Spacing: 0.063 in (1.59 mm)
  • Through Air: 0.063 in (1.07 mm)
  • Over Surface: 0.063 in (1.07 mm)

• Input Protection

  • Voltage Terminal: ±24 VDC continuous
  • Current Terminal: ±28 mA continuous, ±7 VDC

• Power Requirements

  • Internal Rack +5 V: 185 mA
  • Internal Rack +24 V: 110 mA