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The SPDSI13 is a 16-channel Digital Input (DI) module designed for ABB Harmony and Symphony Plus (Bailey INFI 90) rack-based control systems. Although sometimes misclassified in generic databases, the SPDSI13 is a dedicated digital input...
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The SPDSI13 is a 16-channel Digital Input (DI) module designed for ABB Harmony and Symphony Plus (Bailey INFI 90) rack-based control systems. Although sometimes misclassified in generic databases, the SPDSI13 is a dedicated digital input unit intended exclusively for monitoring discrete field signals such as dry contacts, limit switches, and auxiliary relay outputs.
Engineered for high reliability in electrically noisy industrial environments, the SPDSI13 incorporates per-channel optical and galvanic isolation along with integrated hardware filtering. This design protects the control bus from voltage transients and EMI while ensuring clean, stable logic transitions. Manufactured in Sweden to ABB’s industrial quality standards, the SPDSI13 is widely used in sequence-of-events (SOE) and interlocking applications where signal integrity and timing consistency are critical.
| Parameter | Specification |
|---|---|
| Model Number | SPDSI13 |
| Module Type | Digital Input (DI) |
| System Compatibility | Harmony Rack / Symphony Plus / INFI 90 |
| Input Channels | 16 discrete inputs |
| Signal Isolation | Optical and galvanic isolation per channel |
| Input Filtering | Hardware debounce and EMI suppression |
| Rack Occupancy | Single Harmony rack slot |
| Status Indication | Front-panel LEDs for module and diagnostic status |
| Communication | Harmony Control Bus |
| Net Weight | 0.35 kg |
| Dimensions (H × W × D) | 13.7 × 8.5 × 11.9 cm |
The SPDSI13 is commonly deployed in power generation, utilities, and heavy industrial plants for:
Motor Control Centers (MCC) – Monitoring starter “Run,” “Trip,” and “Fault” contacts
Valve Position Feedback – Reading open/close limit switch status
Safety and Interlocks – Input interface for permissives and hardwired safety chains
Sequence-of-Events (SOE) – Reliable capture of discrete state changes
Is the SPDSI13 an analog or digital module?
The SPDSI13 is strictly a Digital Input (DI) module. It does not support analog signals such as 4–20 mA or 0–10 V. For analog applications, ABB SPASI or SPASO series modules should be used.
Can the SPDSI13 be hot-swapped?
Yes. Within the Harmony Rack architecture, the SPDSI13 supports module replacement under power, provided standard ABB safety and maintenance procedures are followed.
Which termination units are used with the SPDSI13?
The module typically interfaces with NBTU or NTDI series termination units via ribbon cables, simplifying field wiring and maintenance.
