AI880 High Integrity Analog Input Module

Features

• 8 channels for 0...20 mA, 4...20 mA, single-ended unipolar inputs.
• Single or redundant configuration.
• 1 group of 8 channels isolated from ground.
• 12-bit resolution.
• Loop Supervised DI function.
• Configurable alarm limit for field power outputs.
• Configurable over/under range for current inputs.
• Current limited transmitter supply per channel.
• Advanced on-board diagnostics.
• Certified for SIL3 according to IEC 61508.
• Certified for Category 4 according to EN 954-1.
• Complies with the NAMUR recommendation NE43, and supports configurable over- and under-range limits.
• HART pass-through communication (AI880A).

Technical Data

General Specifications at 25°C

• Number of channels: 8
• Type of input: Unipolar single-ended
• Measurement range:
  • 0...20 mA
  • 4...20 mA
• Over range:
  • +12% (0...20 mA)
  • +15% (4...20 mA)
• Input impedance (at current input): 250 Ω (with Shunt stick TY801)
• Maximum field cable length: 600 meters (656 yd.)
• Voltage input, maximum non-destructive: 11 V d.c.
• NMRR, 50 Hz, 60 Hz: >40 dB
• Error: <0.1%
• Safety accuracy: 1.9% (configurable 0.6-5%)
• Resolution: 12-bit
• Temperature drift: Max. 50 ppm/°C
• Update cycle time: 10 ms
• Current consumption:
  • 24 V (Modulebus): 50 mA (max)
  • 5 V (Modulebus): 45 mA
  • 24 V (process power supply, UPx): 260 mA (max) (4 + transmitter current)
• Power dissipation: 2.4 W

Transmitter Supply (per channel)

• HART Compatible:
  • Voltage: Process power supply (Upx) - max 4.5 V
  • Current: 32 mA ± 10%

Voltage Supervision

• Internal voltage, field power input, field power output per channel

Input Filter Rise Time (0-90%)

• 190 ms (HW filter)

Isolation

• 8 inputs isolated from ground in one group

Module Termination Units

• TU834 (single)
• TU844, TU845, TU854 (redundant)

MTU Keying Code

• FF (AI880)
  

Rated Insulation Voltage

• 50 V

Dielectric Test Voltage

• 500 V a.c.