Model: DSSB140
Part Number: 48980001-P
Brand: ABB (Hitachi Energy)
Product Type: Serial Interface Module for AC 800M DCS System
1. Overview
The DSSB140 48980001-P is a galvanically isolated serial communication interface designed for the ABB AC 800M Distributed Control System. It enables communication between the AC 800M controller and legacy serial devices (RS‑485 / RS‑422) commonly used in process automation, including instruments, drives, meters, protection relays, and third‑party PLCs.
2. Key Specifications
- System Compatibility: ABB AC 800M DCS
- Communication Interface: 2 × independent, galvanically isolated serial ports
- Standard Configurable: RS‑485 2‑wire / 4‑wire or RS‑422 (software selectable)
- Baud Rate: Up to 115.2 kbps
- Galvanic Isolation: ≥ 500 VRMS (channel-to-channel and channel-to-backplane)
- Supported Protocols:
- Modbus RTU (Master / Slave)
- Serial ASCII / custom serial protocols
- Operating Temperature: -20 °C ~ +60 °C
- Ingress Protection: IP20
- Mounting: DIN rail mounting (AC 800M rack / backplane)
- Voltage Supply: Backplane-powered (no external wiring required)
3. Main Features
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Dual Independent Channels
Two isolated serial ports allow simultaneous connection to two separate serial devices without interference.
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High Galvanic Isolation
Provides strong noise immunity, protects the DCS system from ground loops, surge, and industrial electromagnetic interference (EMI).
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Wide Protocol & Device Support
Primarily used for Modbus RTU communication, widely applied for data acquisition (AI/AO/DI/DO) and remote control.
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Industrial Rugged Design
Wide temperature range, compact design, and long‑term reliability for power, oil & gas, chemical, water treatment, and metallurgical plants.
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Plug-and-Play
Hot-swappable compatible with AC 800M system; easy configuration via Control Builder M.
4. Typical Applications
- Connecting Modbus RTU instruments (flow meters, pressure transmitters, analyzers)
- Communication with variable frequency drives (VFDs)
- Integration of power meters / energy meters
- Interfacing with protective relays and RTU devices
- Linking legacy PLCs or third‑party equipment to AC 800M DCS
5. Summary
DSSB140 (48980001‑P) is a critical communication bridge in the AC 800M system, specializing in reliable serial communication for legacy RS‑485/RS‑422 field devices. With dual isolation, high baud rate, industrial temperature range, and Modbus RTU support, it is a widely used and stable communication module for process automation and DCS retrofits.
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