ABB

Main Functions

Discrete field‑signal acquisition: Collect 16‑channel 24 VDC digital on‑off status signals from field devices, convert hardware contact states into digital data for DCS controller processing.
Channel‑by‑channel optical isolation: Each input channel adopts optocoupler isolation. It isolates field‑side circuit from internal DCS backplane bus, suppresses ground‑loop interference, surge voltage and electromagnetic noise, protects main control hardware from field electrical faults.
Backplane bus data interaction: Transmit collected discrete status data to Logic Master Module or multi‑function controller via Network90 internal rack bus; receive module configuration parameters from main controller.More products: www.plcva.com

ABB Bailey NDSI02 Network Digital Slave Input Module

Hardware self‑diagnosis & status indication: Perform power‑on self‑test and continuous channel monitoring. Front‑panel LED indicators show channel status and module fault conditions; fault information is uploaded to operator workstations for alarm prompting and maintenance troubleshooting.
Industrial noise‑immunity design: Optimized circuit design adapts to harsh cabinet‑installation environment in process plants, ensures stable signal acquisition under strong‑interference working conditions.plcva.com
Modular plug‑in rack structure: Installed in standard Network90 I/O rack. It serves as field‑wiring interface for interlock‑loop signal collection, easy‑to‑replace spare‑part for existing running systems.

ABB Bailey NDSI02 Network Digital Slave Input Module

Compatible control platform: ABB Bailey Network 90 DCS system.
Connected field devices: Limit switches, push‑buttons, relay auxiliary contacts, valve‑position feedback switches, emergency‑stop contacts and other dry‑contact / 24VDC discrete‑signal equipment.
Target industries: Thermal power plants, combined‑cycle power stations, petrochemical plants, pulp‑and‑paper mills and other continuous‑process‑industry sites.
Purpose: Realize field discrete‑status signal collection for safety interlock, equipment‑status monitoring and sequence‑logic control loops. Deliver switch‑state data for DCS alarm, interlock and logic‑judgment. It is an important obsolete spare‑part for maintaining existing Network90 DCS installations to avoid unplanned plant‑system outages.