1. Overview
This module features standard plug-in structure compatible with universal Ovation control rack backplanes. It receives commands and query instructions issued by local rack DPU, distributes them to multiple remote expansion I/O racks, aggregates field measurement data and equipment status signals fed back from remote nodes, and transmits integrated data back to the main controller. Each unit undergoes strict factory burn-in aging testing and precise signal calibration to guarantee reliable long-distance bus communication. Redundant installation eliminates single-point communication link failure risks and ensures uninterrupted automated production operation.
2. Core Functional Features
2.1 Fixed 10 Independent Expansion Channels
The suffix -10 corresponds to 10 physically isolated channels preconfigured at the factory with unified terminal pin assignment and wiring specifications. Each channel operates independently without cross-talk or mutual interference, facilitating standardized cabinet wiring, unified spare part inventory management and rapid on-site replacement.
2.2 Remote I/O Capacity Expansion
It greatly expands the I/O access capability of a single local DPU rack, enabling one master controller to drive multiple geographically scattered remote I/O racks. This reduces the total quantity of DPUs and control cabinets and optimizes the overall layout of the automation control system.
2.3 Channel Galvanic Isolation & Anti-Interference Design
Every expansion channel adopts independent galvanic isolation circuits to eliminate ground potential difference and ground loop interference caused by long field cables. Built-in surge absorption components effectively resist instantaneous voltage spikes and electromagnetic noise inside plant electronic rooms.
2.4 Hot-Swap & Redundant Bumpless Switchover
Online hot swapping is supported while the entire DCS system remains running; maintenance replacement will not disrupt normal data interaction between the main controller and remote I/O racks. Dual-card hot standby configuration achieves automatic bumpless switchover upon failure of the active module, with no disturbance to field control loops.
2.5 Full Onboard Self-Diagnosis
The module continuously monitors bus disconnection, communication timeout, channel short circuit, internal power supply abnormality and backplane bus communication errors. Fault codes and alarm information are uploaded remotely to the Ovation operator workstation, while front panel LEDs provide local visual status prompts for fast on-site troubleshooting.
2.6 Native System Compatibility
Fully compatible with the full series of Ovation DPUs and standard I/O modules. No extra adapter boards or backplane modification are required during installation, applicable both to new project construction and spare part replacement for revamped legacy units.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack plug-in installation
Channel Quantity: 10 independent isolated expansion channels
Power Supply: DC power supplied by rack backplane, no external auxiliary wiring needed
Isolation Scheme: Galvanic isolation between each channel and local backplane bus
Operating Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Meets industrial G3 anti-corrosion standard and anti-interference requirements for power plant control cabinets
4. Front Panel LED Indicator Definition
PWR (Green LED): Steady ON = normal internal module power supply; OFF = power loss or blown internal fuse
CH ACT (Green LED): Flashes when the corresponding channel executes normal data transceiving
COMM (Green LED): Blinking = normal data exchange with local DPU and backplane bus
FAULT (Red LED): Illuminates on hardware damage, bus interruption or communication failure; fault status is latched for maintenance confirmation
5. Application Scope
Thermal Power Industry
Installed in main control racks of boilers, turbines and generators to connect remote I/O racks for flue gas desulfurization, denitrification, ash handling and water treatment auxiliary systems, realizing centralized unified control by the master DPU.
Petrochemical Industry
Deployed in main control cabinets of reactors, fractionators and pipeline delivery units to link multiple distributed field I/O boxes, achieving centralized monitoring and operation of scattered measurement and control points.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Used for bus interconnection between central control racks and field distributed I/O stations, supporting long-cycle unattended stable operation of full production lines.
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