ABB DSDI110A
ABB DSDI110A
ABB DSDI110A
ABB DSDI110A
ABB DSDI110A

ABB DSDI110A | Symphony Plus Series 16-Channel Digital Input Module

  • Brand: ABB
  • Model: DSDI110A
  • Product Type: Digital Input Module
  • Series: Symphony Plus I/O Series
  • Core Function: Provides 16-channel digital signal input (dry contact/transistor) for ABB Symphony Plus DCS, converting discrete field signals to digital data for process monitoring and control.
  • Key Specs: 16 channels, 24VDC input voltage, channel-to-channel isolation (1500Vrms), -25°C to +60°C operating temperature, built-in open-circuit diagnostics.
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Part number: ABB DSDI110A
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Description

DSDI110A: Product Overview
This component is a 16-channel digital input module within ABB’s Symphony Plus I/O Series, designed for industrial process discrete signal acquisition in distributed control systems (DCS). In a DCS architecture, it functions as a field-to-controller interface, positioned in remote I/O stations or controller chassis to acquire digital signals from discrete field devices (e.g., limit switches, proximity sensors, pushbuttons, solenoid status indicators). Its role is to condition low-level digital inputs (dry contact closures or transistor signals), validate signal integrity, and transmit processed binary data (0/1 states) to Symphony Plus controllers (e.g., HS-series) for real-time logic execution and alarm management.
The core functionality involves signal conditioning (debouncing, noise filtering) for 24VDC digital inputs, with software-configurable thresholds for contact bounce elimination. It supports 16 independent channels, each accepting dry contact (normally open/closed) or NPN/PNP transistor inputs (sinking/sourcing compatible). The module includes built-in diagnostics (e.g., open-circuit detection, short-circuit indication) and communicates with controllers via the S800 I/O bus, ensuring deterministic data transfer with minimal latency.
It belongs to the Symphony Plus I/O Series, optimized for modularity, backward compatibility, and integration with ABB’s legacy and current control systems. The platform’s benefits include standardized mounting to Symphony Plus I/O racks, seamless configuration via ABB’s Control Builder M software, and adherence to IEC 61131-2 (signal integrity) and IEC 61000-4 (EMC)—ensuring interoperability with global field device suppliers and simplified system upgrades.

ABB DSDI110A

ABB DSDI110A

DSDI110A: Technical Specifications
  • Model Number: DSDI110A
  • Manufacturer: ABB
  • Product Type: Digital Input Module
  • Number of Channels: 16 (independent, software-configurable)
  • Input Type: Dry contact (normally open/closed), transistor (NPN/PNP sinking/sourcing)
  • Input Voltage: 24VDC (±10% tolerance, 5mA per channel typical)
  • Electrical Isolation: Channel-to-channel and channel-to-bus (1500Vrms)
  • Power Supply: 24V DC (±10%, drawn from Symphony Plus I/O rack backplane)
  • Operating Temperature: -25°C to +60°C
  • Storage Temperature: -40°C to +85°C
  • Protection Rating: IP20 (panel-mount, finger-safe terminals)
  • Signal Filtering: Configurable debounce time (0-100ms)
  • Communication Interface: S800 I/O bus (proprietary, high-speed serial)
  • Dimensions: 198mm x 25mm x 120mm (WxHxD, S800 I/O form factor)
  • Weight: 0.26kg
Core Features & Customer Value​
The module’s design prioritizes signal integrity, scalability, and operational efficiency. The 16-channel density reduces the number of I/O modules required per system—for example, a packaging line requiring 32 discrete inputs can be served by two DSDI110A modules instead of four lower-density alternatives, saving cabinet space and wiring costs. For engineers, this consolidation simplifies commissioning and inventory management.
Channel-to-channel isolation (1500Vrms) prevents ground loops and electromagnetic interference (EMI) from adjacent channels—essential in environments with heavy machinery (e.g., steel mills), where motor drives generate noise. This ensures accurate detection of low-level signals (e.g., a proximity sensor near a VFD), avoiding false process alarms. Configurable debounce time (0-100ms) accommodates noisy contacts (e.g., mechanical switches in dusty environments), reducing spurious state changes.
Built-in diagnostics (open-circuit, short-circuit) enable proactive maintenance: the module flags a failed sensor (e.g., an open limit switch in a conveyor system) via controller alarms, allowing technicians to replace it before a process interruption. Integration with Control Builder M software streamlines configuration: engineers define input types, filtering parameters, and alarm thresholds via a graphical interface, with automatic generation of diagnostic tags. This consistency with other Symphony Plus I/O modules reduces training time and minimizes configuration errors.

ABB DSDI110A

ABB DSDI110A

Typical Applications​
In a petrochemical refinery’s fluid catalytic cracking (FCC) unit, the module acquires 16 dry contact signals from emergency shutdown (ESD) pushbuttons and valve position indicators. The 1500Vrms isolation prevents EMI from nearby compressors, while diagnostics alert operators to a stuck pushbutton (open circuit), ensuring fail-safe shutdown capability.
At a power plant’s boiler feedwater system, it connects 8 proximity sensors (monitoring pump status) and 8 limit switches (tracking valve positions). The -25°C to +60°C operating range suits unheated control rooms, and S800 I/O bus ensures fast data transfer to the Symphony Plus controller for pump-vessel interlock logic.
In a wastewater treatment plant, the module reads 16 transistor inputs from float switches (monitoring basin levels) and motor contactor status. Channel isolation prevents noise from aerator VFDs from corrupting level signals, while open-circuit diagnostics identify fouled float switches before overflow occurs.

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