Description
‑ Power Supply：Power supplied by rack back‑plane, 5VDC logic power supply
‑ Mechanical Structure：Rack plug‑in module for Symphony Plus rack；overall weight approx 0.55kg
‑ On‑board Resources：Input signal conditioning circuit, channel debounce filter circuit, contact state detection circuit, hardware self‑diagnosis circuit.
‑ Communication Interface：Internal rack back‑plane module bus for communicating with station controller.
‑ Galvanic Isolation：Group‑to‑system galvanic isolation, isolation voltage 1500VRMS, suppress ground loop interference from field contact devices.
‑ Core Function：Field digital switch‑contact signal acquisition, signal debounce filtering, channel fault detection, transmit switch‑state data to station controller through back‑plane bus.
‑ Protection：Per‑channel input surge and over‑voltage protection.
‑ Status LED Indicators：Power LED, fault LED, module status LED.
‑ Weight：approx 0.55kg
‑ SPDSI22 is high‑channel digital input module for Symphony Plus DCS, receives field dry contact or wet contact digital signals, channel anti‑chattering filter time configurable, eliminate on‑site contact jitter interference.
‑ Collect equipment feedback status, limit switch, relay contact, breaker auxiliary contact signals, convert contact on‑off state into DCS internal digital point value, upload to SPBRC series controller.
‑ Built‑in comprehensive self‑diagnosis function, detect module hardware failure and channel abnormal state, fault alarm information upload to DCS operator station.
‑ Installed on Symphony Plus standard rack, cannot work independently, must cooperate with station controller and supporting terminal wiring unit for field equipment connection.
Difference compared with SPASI23：SPDSI22 is digital input module for switch‑contact status collection; SPASI23 is universal analog input module for temperature, pressure analog quantity acquisition.
‑ Complete field digital contact signal acquisition and filtering processing, upload switch‑state value to station controller.
‑ Monitor module hardware running status and each channel signal condition, fault information upload to DCS system.
‑ No independent process control logic function, interlock and sequence algorithm run on upper‑level SPBRC controller.
‑ Back‑plane：Rack internal back‑plane module bus for data communication and module power supply.
‑ External interfaces：Connect field switches and relay contacts through matched terminal wiring unit.
‑ Mounting：Plug‑in installation on Symphony Plus standard rack
‑ Operating Temperature：0 ℃ ~ +70 ℃
‑ Storage Temperature：‑40 ℃ ~ +85 ℃
‑ Relative Humidity：5‑95 %RH, non‑condensing
‑ Pollution degree：Degree 2
‑ Protection Class：IP20, cabinet‑internal installation.
- SPDSI22 smart process digital input slave module（6643936X1）
Complementary parts: Symphony Plus rack, SPBRC400/SPBRC410 bridge controller, matched digital input terminal unit, field auxiliary contacts / relay switch devices, signal cable, system network, operator station.
‑ Insert module into correct I/O slot of Symphony Plus rack, tighten front‑panel locking knobs to ensure reliable back‑plane connector contact.
‑ Field digital signal wiring adopt signal cable, separate layout from high‑voltage power cable to reduce electromagnetic interference. Configure channel debounce time according to field contact actual condition.
‑ Module replacement recommends power‑off operation. After replacement, download corresponding configuration, verify each channel switch state consistent with field equipment feedback.
‑ Distinguish dry‑contact and wet‑contact application mode on terminal unit, avoid wrong wiring leading to channel damage.
Power plant, petrochemical, pulp‑and‑paper industry Symphony Plus DCS control cabinets; digital signal acquisition spare‑part, collect breaker auxiliary contact, valve feedback, equipment running status signals.
- ABB Symphony Plus SPDSI22 smart process digital input slave module (6643936X1), high‑density DI I/O slave module for Symphony Plus DCS.
- Support dry‑contact / wet‑contact digital input, configurable channel debounce filter, adapt to industrial field contact bounce.
- Group‑channel galvanic isolation, per‑channel surge protection, hardware and channel fault self‑diagnosis, alarm upload function.
- Rack plug‑in structure, cabinet‑internal IP20 application, cooperate with special terminal unit for field contact‑signal wiring.
- Only undertake digital signal acquisition and filtering processing, control logic executed by SPBRC series station controller.
- Discontinued legacy DCS spare‑part, used for old‑system maintenance and retrofit projects。
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