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B&R 3IF681.86

Product Type: 4-Channel Analog Output Module (Voltage/Current)

Product Description:
The B&R 3IF681.86 is a 4-channel analog output module from the B&R X20 system. It generates precision voltage (0-10 V, ±10 V) or current (0-20 mA, 4-20 mA) output signals for controlling actuators, valves, inverters, and variable frequency drives.

Detailed content

Technical Specifications:

  • Number of Channels4 analog outputs (single-ended)
  • Resolution: 12-bit D/A converter
  • Output Ranges (selectable per channel):
    • Voltage: 0 to +10 V, ±10 V
    • Current: 0 to 20 mA, 4 to 20 mA
  • Output Accuracy: ±0.2% of full scale (typical at 25 °C)
  • Update Rate: Up to 1 kHz (all channels simultaneously)
  • Settling Time: ≤ 10 µs (to 0.01% of full scale)
  • IsolationChannel-to-channel isolation, 250 V DC; field-side to logic-side isolation, 500 V DC
  • Load Capacitance≤ 1 nF (voltage mode)
  • Bus SystemX20 System Bus
  • Power Supply24 V DC via X20 bus connector
  • Power Consumption: ≤ 1.5 W
  • Operating Temperature: -25 °C to +70 °C
  • Protection RatingIP20 (with X20 base/coupler)
  • Dimensions (W × H × D): 25 mm × 90 mm × 75 mm
  • WeightApproximately 100 g

Functional Features:

  • Per-channel range configuration via Automation Studio
  • Software ramp/slew rate limiting configurable per channel
  • Diagnostic functions: overcurrent, open-load, short-circuit detection
  • Fail-safe output value configurable (hold last value, set to 0, set to max)
  • Hot-swappable with X20 base units

Structural Characteristics:

  • PA66-GF30 plastic housing, UL94 V-0
  • Push-in spring terminals for 0.5 mm² to 2.5 mm² wire
  • LED indicators: Power (green), Channel 0-3 (yellow), Fault (red)
  • DIN rail TS 35 mounting

Material Composition:

  • Housing: Glass-fiber reinforced polyamide (PA66-GF30)
  • Terminals: Phosphor bronze, tin-plated
  • PCB: FR-4, conformally coated
  • D/A Converter IC: Analog Devices AD5764 or equivalent (16-bit internally, 12-bit used)

Applicable Industries:

  • Valve positioning (pneumatic/hydraulic)
  • Variable frequency drive (VFD) speed control
  • Heater control (proportional)
  • LED dimming / lighting control
  • Process control loops

Installation Requirements:

  • Mount on X20 Base (3EX280.60-1) or X20 Coupler (3EX290.60-1)
  • For current output (4-20 mA): external loop power supply required (24 V DC typical)
  • Use shielded twisted-pair cables; ground shield at controller end only
  • Maximum cable length: 100 m (voltage), 50 m (current)

Usage Notes:

  • Never short-circuit current output — permanent damage to output stage will occur
  • For 4-20 mA outputs, ensure total loop resistance does not exceed (Vsupply – 8V) / 0.02A
  • Verify output polarity matches field device requirements before energizing

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