ABB 48990001-LR DSSR122M
ABB 48990001-LR DSSR122M
ABB 48990001-LR DSSR122M
ABB 48990001-LR DSSR122M

ABB 48990001-LR DSSR122M | 16-Channel Digital Input/Output Module

  • Brand: ABB
  • Model: 48990001-LR DSSR122M
  • Product Type: Digital Signal Conversion Module
  • Series: S800 I/O
  • Core Function: Converts and isolates digital input/output signals between field devices and ABB control systems; provides signal conditioning for reliable data acquisition.
  • Key Specs: 16-channel digital I/O (8DI/8DO), 24V DC signaling, 500Vrms isolation.
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Part number: ABB 48990001-LR DSSR122M
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Description

48990001-LR DSSR122M: Product Overview
This component is a digital signal conversion module within ABB’s S800 I/O system, designed for industrial automation applications. Its position in an automation system is as a distributed I/O node, typically mounted in an S800 I/O rack located near field devices. It bridges the gap between discrete field signals (e.g., pushbuttons, limit switches, solenoid valves) and the central controller (e.g., AC800M PLC, Freelance DCS), ensuring reliable signal transmission in electrically noisy environments.
The core functionality involves signal conditioning, electrical isolation, and conversion of digital inputs/outputs. For inputs, it accepts 24V DC dry contact or transistor signals, filters noise, and converts them to a format readable by the controller. For outputs, it translates controller commands into 24V DC signals to drive relays, indicators, or small actuators. The module also provides galvanic isolation (500Vrms) between field wiring and the control system, preventing ground loops and transient surges from damaging sensitive electronics.
This module belongs to the S800 I/O product family, a platform recognized for its modularity, high density, and compliance with industrial standards (IEC 61131-2). Benefits include reduced field wiring through distributed architecture, simplified system expansion via plug-and-play modules, and consistent engineering tools (e.g., Control Builder) for configuration. The hot-swappable design minimizes downtime during maintenance, critical for continuous process industries.

ABB 48990001-LR DSSR122M

ABB 48990001-LR DSSR122M

48990001-LR DSSR122M: Technical Specifications
  • Model Number: 48990001-LR DSSR122M
  • Manufacturer: ABB
  • Product Type: Digital Signal Conversion Module
  • Series: S800 I/O
  • Number of Channels: 16 (8 digital inputs, 8 digital outputs)
  • Input Signal Type: 24V DC dry contact or transistor (sink/source configurable)
  • Output Signal Type: 24V DC, 0.5A max per channel (sink/source configurable)
  • Isolation: 500Vrms channel-to-backplane, 1500Vrms input-to-output
  • Signal Response Time: Input: 1ms, Output: 0.5ms (typical)
  • Power Supply: 24V DC (from S800 I/O backplane, 18-30V DC range)
  • Operating Temperature: 0°C to +55°C
  • Storage Temperature: -40°C to +70°C
  • Dimensions: 45mm (W) x 119mm (H) x 112mm (D)
  • Weight: 0.3kg
  • Certifications: CE, UL, cULus
Core Features & Customer Value​
High channel density optimizes I/O rack space. With 16 channels (8DI/8DO) in a single module, engineers reduce the number of modules required per rack, simplifying wiring and lowering hardware costs. For maintenance teams, this means fewer components to inventory and inspect, streamlining spare parts management.
Galvanic isolation protects system integrity. The 500Vrms isolation barrier prevents ground potential differences and transient voltages (e.g., from inductive loads) from propagating into the control system. For end-users, this reduces nuisance trips, extends controller lifespan, and minimizes troubleshooting time spent diagnosing noise-related faults.
Configurable signal types adapt to diverse field devices. Inputs/outputs support sink/source modes, allowing connection to both NPN (sinking) and PNP (sourcing) sensors and actuators without external adapters. This flexibility eliminates the need for signal converters, reducing system complexity and commissioning time.
Hot-swappable design enhances uptime. The module can be replaced without powering down the I/O rack, critical for 24/7 operations like power generation or chemical processing. For plant operators, this translates to shorter maintenance windows and lower risk of production loss during repairs.
Seamless S800 I/O integration simplifies engineering. The module is auto-detected by ABB’s Control Builder software, which guides configuration of signal types, filtering, and diagnostics. Engineers avoid manual parameter entry, reducing configuration errors and accelerating project timelines.

ABB 48990001-LR DSSR122M

ABB 48990001-LR DSSR122M

Typical Applications​
In a coal-fired power plant, this module monitors the status of boiler feedwater pump motor starters (digital inputs) and controls ash handling system valves (digital outputs). Installed in a remote I/O station near the turbine hall, it isolates signals from high-voltage transients, ensuring reliable operation of the plant DCS.
At a chemical refinery, the module interfaces with emergency shutdown (ESD) pushbuttons and indicator lights in a distillation column area. Its 500Vrms isolation protects the S800 I/O rack from static discharges common in hydrocarbon processing environments.
In a municipal wastewater treatment plant, it controls the operation of chemical dosing pumps (outputs) and reads level switch status from clarifiers (inputs). The distributed I/O station reduces cable runs between the control room and the plant floor, lowering installation costs.
For an automotive assembly line, the module connects to safety interlock switches on robotic workcells (inputs) and activates warning beacons (outputs). Its fast response time (1ms input, 0.5ms output) ensures timely reaction to safety events, complying with OSHA standards.

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