1. Overview
This termination base adopts standard rack-mounted mechanical structure fully compatible with universal Ovation control rack backplanes. It integrates screw terminal blocks, gold-plated backplane bus connectors, anti-vibration module snap locking structure and per-channel replaceable miniature fuses. Field analog and digital signal cables terminate directly onto base terminals; the upper-layer I/O electronic module is inserted and locked in place to realize bidirectional transmission of field process signals and DPU control commands. Every base undergoes factory continuity testing, high-voltage insulation withstand test and wiring consistency verification, guaranteeing long-term anti-loose wiring reliability under continuous long-cycle industrial running conditions.
2. Core Functional Features
2.1 Standard Numbered Terminal Wiring Design
Equipped with one-to-one channel numbered screw terminal rows, applicable for shielded multi-core signal cable fixed wiring; channel marking fully corresponds to matched upper electronic module channels, convenient for on-site cable laying, marking identification and later maintenance circuit checking.
2.2 Independent Single-channel Fuse Overload Protection
Each signal channel is equipped with a replaceable miniature fuse independently arranged on the base side. Short-circuit or overload fault of one single field cable only blows the corresponding channel fuse, without triggering power loss or signal interruption of adjacent channels and the whole rack loop; spare fuse holders are reserved for rapid on-site maintenance replacement.
2.3 Anti-Vibration Mechanical Locking Mechanism
Built-in module buckle locking structure firmly fixes the inserted I/O electronic module, effectively resisting cabinet vibration caused by fans and large rotating equipment, avoiding poor contact or accidental module ejection; tool-free quick-unlock design simplifies module disassembly operation.
2.4 Backplane Bus Bridging & Isolated Power Distribution
Internal PCB circuit completes electrical bridging between rack backplane bus and inserted I/O electronic module, distributes rack DC working power to the electronic module, and physically isolates field signal loops and internal DCS control power loops to eliminate cross interference between different loops.
2.5 Supports Electronic Module Hot-Swap Maintenance
After base installation and field wiring completion, the matched upper I/O electronic module can be hot-plugged and replaced online while the DCS system keeps normal operation, without re-terminating field cables, greatly shortening equipment maintenance downtime.
2.6 Enhanced Insulation & Surge Suppression Performance
Base housing adopts high flame-retardant high-insulation engineering plastic; transient surge absorption components are integrated at terminal side, suppressing lightning-induced surges and cable coupled voltage spikes from invading the internal circuit of I/O electronic modules.
2.7 Excellent System Compatibility
Fully compatible with full-series Ovation plug-in I/O electronic modules (AI, AO, DI, DO, RTD, frequency/pulse counting modules). Directly installed into standard Ovation rack slots without adapter plates or cabinet reconstruction, suitable for new cabinet assembly and spare part replacement during old unit renovation projects.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack fixed installation, pluggable with matched electronic I/O modules
Wiring Terminal: Screw-type stranded cable fixed terminals, unified channel serial number marking
Built-in Protection: Per-channel independent replaceable miniature fuse, transient surge absorption circuit
Insulation Resistance: ≥100 MΩ (500 VDC test voltage)
Withstand Voltage: Channel-to-backplane isolation withstands 1000 VAC isolation voltage
Working Power: DC power supplied from rack backplane, distributed to upper module via internal circuit
Operating Ambient Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Complies with industrial G3 anti-corrosion standard and power plant cabinet anti-interference requirements
Hot-Swap Specification: Single electronic module can be hot-swapped one by one under system energized state; non-intrinsically safe field loops need power cut-off before plugging/unplugging operation
4. Front Panel Status Indicator Definition
PWR (Green LED): Steady ON = base internal power distribution normal; OFF = fuse blown or backplane power loss
CH Channel Status LED: Lights up when corresponding field signal loop is connected normally
FAULT (Red LED): Lights up when channel fuse blows or terminal wiring short-circuits, supporting precise fault location
5. Application Scope
Thermal Power Industry
Used as signal wiring carrier for AI/AO/DI/DO/RTD modules in boiler, turbine and generator control cabinets, connecting temperature, pressure, flow, valve feedback, motor running status and other field instrument cables.
Petrochemical Industry
Serves as termination base for I/O modules in reactor, fractionator and pipeline unit control cabinets, realizing stable long-term connection of process measurement signals and actuator control cables.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Realizes centralized termination and circuit protection of all field control signal cables inside control cabinets, supporting long-cycle unattended stable operation of full production line automation systems.
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