Technical Specifications Model: DSTYW121 System Compatibility: ABB Freelance DCS System Channel Quantity: 16 digital output channels Load Signal Level: 24 V DC Per‑channel Maximum Load Current: 0.5 A Per‑channel Fuse Rating: 500 mA replaceable fuse Galvanic Isolation: 500 V AC field‑to‑logic isolation Terminal Type: Screw clamp terminal, wire range 0.2‑2.5 mm² Mounting Mode: DIN‑rail TS35 mounting Power Supply: External 24 V DC field power supply Operating Temperature: 0 ℃ to +60 ℃ Storage Temperature: ‑40 ℃ to +85 ℃ Relative Humidity: 5‑95 %, non‑condensing Protection Class: IP20 Certifications: CE
Functional Features Sixteen independent output channels provide field‑side wiring termination for digital output signals. Channel‑wise replaceable fuse delivers hardware over‑current protection for field load loops. Built‑in surge‑suppression components absorb inductive‑load back‑electromotive force. Group‑wise galvanic isolation blocks field‑side surge interference from invading DCS main I/O module. Front‑panel LED indicators display real‑time output actuation status for each channel. Compact DIN‑rail mounting structure supports flexible cabinet layout and convenient maintenance.
Application Scenarios Spare‑part replacement for DSTYW121 output termination board in Freelance DCS cabinet. Driving signal termination for field intermediate relays, indicator lamps and small‑size solenoid valves. Protection and signal conditioning for discrete output loops in chemical, power and pulp‑paper industrial sites. Hardware overhaul and spare‑part renewal for legacy ABB Freelance DCS projects.
Installation Requirements Snap DSTYW121 onto standard TS35 DIN‑rail inside control cabinet. Connect external 24 V DC field power supply and field load equipment cables to front screw‑clamp terminals, tighten terminals to specified torque. Connect rear flat‑cable between DSTYW121 and matched Freelance digital output module. Complete protective earthing according to Freelance system grounding specification. Separate field power‑load cables from weak‑signal analog cables inside cabinet. Ambient operating temperature shall keep within 0 ℃ ~ +60 ℃ without condensation.
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