ABB DSTA131
ABB DSTA131 - Image 2

ABB DSTA131

Product Brief:​ The DSTA131 is a passive field-termination / connection unit (also called a terminal sub-base or connection unit) for ABB Advant S100 analog I/O modules (e.g., DSSA165 AI, DSSO1x0 AO). It provides screw-type field wiring terminals and signal routing to the plug-in analog module above it. It may include shunt resistors for current measurement, cold-junction compensation (CJC) sensors for TC inputs (when paired with TC-capable AI module), and test points. The DSTA131 itself contains no active electronics.

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Category: SKU: ABB DSTA131

Description

ABB DSTA131

  • Technical Specifications:
    • Function: Passive signal termination — routes field wires to module pins via gold-plated edge connector
    • Terminals: Screw terminals, 0.2–2.5 mm² wire size; pitch 5.08 mm or 7.62 mm
    • Channels: Matches module — typically 8 or 16 analog channels + commons / compensation terminals
    • Built-in Features: CJC sensor (on TC versions — Pt100 CJC element on board); shunt resistor options (for special current inputs — usually not on std voltage/current AI which has internal shunt)
    • Isolation: Signal wires referenced to module common; isolation to earth provided by module’s internal A/D isolation
    • Mounting: Snaps onto 35 mm DIN rail; mates mechanically with S100 analog I/O module above
    • Material: Flame-retardant polyamide (PA66) with tin-plated brass terminals; aluminum heat-spreader under CJC area
    • Operating Temp.: –20 °C to +60 °C
    • Dimensions: ≈100 × 120 × 45 mm (W × H × D) depending on channel count
  • Functional Features:
    • Test jacks / test points per channel for measuring loop current/voltage with multimeter without breaking circuit
    • Clearly labeled terminal numbering matching ABB S100 I/O wiring diagrams
    • CJC sensor (on TC version) feeds reference temperature to AI module for accurate TC linearization
    • Removable terminal block (on some variants) for easy module replacement without rewiring
  • Application Scenarios:
    • Terminating 4–20 mA 2-wire transmitter loops to DSSA165 analog input module
    • Connecting Pt100 RTDs (3-wire) or thermocouples with CJC to S100 AI module
    • Providing local test access for calibration / troubleshooting analog loops
  • Material & Structure / Working Principle / Installation / Precautions:
    • Mount DSTA131 on DIN rail, plug analog module (DSSA165 etc.) directly onto it — engage both mechanical latches
    • For 4–20 mA: + from transmitter to Ix(+), – to Ix(–) / common; ensure loop powered correctly
    • For TC: use compensating / extension wire type matching TC; connect +/– correctly; CJC must not be covered by warm air streams
    • For RTD 3-wire: connect leads per diagram — two to one terminal (common), one to sense terminal
    • Do NOT apply >30 V between any input terminal and common — may damage module plugged above
    • Keep thermocouple wiring separated from AC power / VFD cables to avoid induced noise

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