While the T3480 sources current, the T3481 does the opposite: it sinks 4-20 mA from externally-powered field devices, giving you galvanic isolation between each loop and the Tricon back-plane. Built for SIL-3 reverse-acting control valves, VFD speed references and solenoid-driver cards that already carry their own 24 V or 48 V bulk supply, the T3481 lets you mix high-side and low-side commons on the same marshalling panel without risking sneak circuits.
Core concept in one line
Think of T3481 as 16 identical, triple-voted precision current-sinks that can live on either the positive or the negative leg of a loop—your cable schedule decides, not the board.
Highlights you won’t find on Google
• Each channel is a “floating” 60 V-rated MOSFET array; you can wire it high-side (sink on return) or low-side (sink on supply) simply by flipping the plug-in jumper.
• On-board 2oo3 Hall-effect current sensors measure real loop current, not DAC set-point—detects a jammed valve positioner even if the cable looks healthy.
• Built-in soft-clamp diode matrix absorbs inductive kick from large solenoids; no external free-wheel diode needed up to 1 H load inductance.
• Daisy-chain 24–60 V field bus: one pair feeds multiple loops, cutting 30 % copper versus conventional single-supply wiring.
Quick-spec
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Parameter
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Value
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Function
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16-ch isolated current sink
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Sink range
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0–22 mA (4–20 mA default)
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Loop voltage
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12–60 V dc (field supplied)
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Load (resistive)
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0–3 kΩ @ 60 V
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Accuracy
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±0.06 % FSR
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Resolution
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13-bit monotonic
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CMRR/IMRR
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150 dB (50 Hz), 140 dB (DC)
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Update time
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1 ms all channels
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Isolation
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650 V rms ch-to-ch, ch-to-bus
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Inductive energy
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Absorbs 1 J without crowbar
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Diagnostic pulse
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0.2 mA, 100 µs, HART-transparent
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Rack power
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5 V dc 1.0 A, 3.3 V 0.3 A
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MTBF (Telcordia)
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1.14 million h
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Temperature
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–40 … +70 °C
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Weight
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1.9 kg
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Termination
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Quick-plug 3.81 mm, 26–12 AWG
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Typical wiring recipes
① Reverse-acting valve: +24 V → valve → T3481 CHx → 0 V. Jumper set to “low-side sink”.
② VFD reference: VFD 10 V source → T3481 CHx → return. Jumper set to “high-side sink”; board floats at +10 V, Tricon remains earth-free.
③ Mix 24 V and 48 V loops on the same FTA—just keep the daisy-chain within 60 V max; the Hall sensor doesn’t care.
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