1. Overview
This module adopts standard plug-in mechanical structure fully matching the universal backplane of Ovation control racks. It receives control instructions and polling commands transmitted from the local rack DPU, distributes these signals to each remote expansion I/O rack, collects field measurement data and equipment operating status uploaded from remote nodes, then packages and returns integrated data to the main controller. Every individual module undergoes strict factory burn-in aging test and precise bus signal calibration to guarantee reliable long-distance communication stability. Redundant installation completely avoids single-point communication link failure risks and ensures uninterrupted automated production operation.
2. Core Functional Features
2.1 Fixed 10 Independent Isolated Channels
The suffix -10 represents 10 physically separated channels preset at the factory with unified pin assignment and wiring specifications. Each channel operates independently without crosstalk or mutual interference, simplifying standardized cabinet wiring, unified spare parts inventory management and rapid on-site replacement work.
2.2 Large-Scale Remote I/O Expansion
It effectively expands the maximum I/O access capacity of a single local DPU rack, enabling one master controller to drive multiple remote distributed I/O racks. This reduces the total number of DPUs and control cabinets required, optimizes the overall topology layout of the automation control system and lowers construction and maintenance costs.
2.3 Galvanic Isolation & Strong Anti-Interference Capacity
Each expansion channel is equipped with dedicated isolation circuits, which eliminate ground potential deviation and ground loop interference induced by long-distance field cables. Built-in surge absorption components can resist instantaneous voltage spikes and complex electromagnetic noise inside power plant and chemical plant electronic control rooms.
2.4 Hot-Swap & Bumpless Redundant Switchover
The module supports online hot swapping while the entire DCS system keeps running; maintenance replacement will not interrupt normal bidirectional data interaction between the main controller and remote I/O racks. Dual-card hot standby configuration realizes automatic bumpless switchover once the active module fails, causing no fluctuation to on-site control loops and actuators.
2.5 Full-Range Real-Time Self-Diagnosis
The module continuously monitors bus disconnection, communication timeout, channel short-circuit, internal power supply abnormality and backplane bus communication exceptions. Fault codes and alarm messages can be uploaded remotely to the Ovation operator workstation for centralized monitoring, while front panel LED indicators provide local intuitive status prompts to accelerate on-site troubleshooting.
2.6 Excellent System Compatibility
It is natively compatible with the full range of Ovation DPUs and standard I/O modules. No additional adapter boards or backplane reconstruction modifications are required during installation, applicable to both new project construction and spare part replacement for old unit renovation projects.
3. Key Technical Specifications
Mounting Method: Standard Ovation rack plug-in installation
Number of Channels: 10 independent isolated expansion channels
Power Supply: Powered by control rack backplane DC power supply, no external auxiliary wiring needed
Isolation Mode: 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 Standard: Complies with industrial G3 anti-corrosion grade and anti-interference requirements for power plant control cabinets
4. Front Panel LED Indicator Definition
PWR (Green LED): Steady ON = module internal power supply normal; OFF = power loss or internal fuse blown
CH ACT (Green LED): Flashes when the corresponding channel completes normal data transmission and reception
COMM (Green LED): Blinking = normal data exchange with local DPU and backplane bus
FAULT (Red LED): Illuminates upon hardware damage, bus breakage 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 removal and water treatment auxiliary systems, supporting centralized unified control by the master DPU.
Petrochemical Industry
Deployed in main control cabinets of reactors, fractionators and pipeline transmission units to link multiple geographically scattered field I/O boxes, realizing centralized monitoring and operation of dispersed 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 full production line operation.
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