Product Introduction

Model Interpretation

• 48980001‑P: ABB material number for ordering and traceability.

• DSSB140: Product series designation (serial I/O module for AC 800M).

• 48980001: Base part number; ‑P: variant/version identifier.

Technical Parameters

• Module Type: Dual‑channel isolated serial communication module.

• Interface Standard: RS‑485 / RS‑422 (software selectable).

• Communication Channels: 2 independent, electrically isolated channels.

• Isolation Voltage: ≥500 VRMS (channel‑to‑channel, channel‑to‑backplane).

• Max Baud Rate: 115.2 kbps.

• Data Format: 5–8 data bits, 1–2 stop bits, odd/even/no parity.

• Power Supply: 24 V DC (19.2–30 V DC).

• Operating Temperature: 0 °C to +60 °C.

• Protection Class: IP20.

• Certifications: CE, UL 61010‑2‑201, IEC 61000‑6‑2/4.

• Weight: Approx. 0.5 kg.

Interface and Communication Configuration

• Serial Ports: 2× RS‑485/RS‑422 isolated ports, configurable via Control Builder M.

• Supported Protocols: Modbus RTU (master/slave), custom ASCII protocols.

• Backplane Connection: AC 800M controller backplane, plug‑in installation.

• LED Indicators: Power, RUN, FAULT, and channel communication status for diagnostics.

• Cabling: Shielded twisted pair recommended; separate from power cables for EMC.

Core Functions

• Serial Data Exchange: Connects AC 800M to serial devices (sensors, meters, drives, RTUs) via Modbus RTU or ASCII.

• Electrical Isolation: 500 VRMS isolation reduces ground loops and EMI in switchyards and heavy industry.

• Protocol Flexibility: Software‑selectable RS‑485/RS‑422 and configurable data formats for multi‑vendor integration.

• Diagnostics: Onboard LEDs and controller‑based monitoring for quick fault localization.

• High Availability: Supports hot‑swap in redundant AC 800M systems (with redundant backplane).

Application Scenarios

• System Compatibility: ABB AC 800M DCS, 800xA, and S800 I/O systems.

• Industries: Power generation, oil and gas, chemical, pulp and paper, metallurgy, water treatment.

• Typical Uses: Connecting Modbus RTU meters, analyzers, variable‑speed drives, and legacy serial devices to AC 800M controllers.

Operation and Maintenance Instructions

• Installation: Plug into AC 800M rack (TK811A/TK821A base); ensure proper grounding and clearance for cooling.

• Wiring: Use shielded twisted pair for serial lines; isolate from AC power cables to avoid interference.

• Configuration: Set channel mode (RS‑485/RS‑422), baud rate, data format, and protocol via Control Builder M.

• Maintenance: Inspect connections and LEDs quarterly; perform firmware updates during scheduled downtime.

• Replacement: Hot‑swap in redundant systems; power off non‑redundant racks before removal.