AI835A

Description

AI835A is an 8-channel differential analog input module from ABB, designed for high-accuracy measurements with 15-bit resolution. It features comprehensive diagnostics, robust isolation, and long cable support for industrial environments.

Input Specifications

• Channels: 8 differential

• Resolution: 15 bits

• Input impedance: > 1 MΩ

• Error margin: Max. 0.1%

• Temperature drift: Typ. 5 ppm/°C, Max. 7 ppm/°C

• CMRR (50/60 Hz): 120 dB

• NMRR (50/60 Hz): > 60 dB

• Maximum field cable length: 600 m

Electrical Characteristics

• Rated insulation voltage: 50 V

• Dielectric test voltage: 500 V AC

• Power dissipation: 1.6 W

• ModuleBus current consumption (+5 V): 75 mA

• ModuleBus current consumption (+24 V): 50 mA

• External current consumption (+24 V): 0

Timing

• Update cycle time at 50 Hz: 280 + 80 × active channels (ms)

• Update cycle time at 60 Hz: 250 + 70 × active channels (ms)

Diagnostics & Supervision

• Front LEDs: F (Fault), R (Run), W (Warning)

• Supervision types:

• Module error: reference channels, power supply low

• Channel error: open-circuit

• CJ channel (ch 8): below –40 °C or above +100 °C

• Status indications: Module Error, Module Warning, Channel Error (8)

Mechanical Data

• Width: 45 mm

• Height: 119 mm

• Depth: 102 mm (111 mm including connector)

• Weight: 0.22 kg

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