This analog output board converts digital control signals transmitted by the MRC master board into standard industrial analog current signals for driving field actuators, control valves, frequency converters and regulating equipment. It outputs standard 4–20mA analog signals, with high linearity signal conversion circuits. Each channel adopts independent D/A conversion unit and isolated output design to avoid cross-channel interference. The module supports output fault detection, open-circuit and short-circuit diagnosis of field load loops, and feeds back loop fault signals to the DCS main controller in real time.
Compared with later upgraded revisions, G01 is the foundational stable version, equipped with basic linear D/A conversion, single-stage isolation and standard loop diagnosis functions, meeting conventional process regulation demands of thermal power, chemical industry and metallurgy. It adopts stable signal conversion chips with low temperature drift to guarantee consistent output precision under normal cabinet operating temperature.
The circuit board adopts multi-layer high-temperature resistant FR-4 industrial PCB with basic electromagnetic shielding layout. Each output channel provides 1000V AC/DC galvanic isolation between field load terminals and internal logic circuits, isolating interference from field actuator power loops. Every finished module passes standard factory reliability tests: 72-hour high-low temperature cyclic aging test, full-channel 4–20mA linearity calibration, long-term full-load bus communication burn-in, load open/short-circuit fault simulation test.
It supports single-slot hot-swappable online replacement without shutting down the entire DCS remote station, and integrates multi-level hardware protection for each output channel: surge suppression, overcurrent protection, reverse wiring protection, short-circuit automatic locking protection. Independent LED diagnostic indicators display power supply status, MRC bus communication status and single-channel output loop fault alarms for quick on-site inspection and maintenance.
Technical Specifications
PCB Substrate: Multi-layer high heat-resistant FR-4 industrial printed circuit board
Operating Temperature Range: -25℃ ~ +75℃
Storage Humidity: 5% ~ 90% RH, non-condensing
EMC Compliance: Industrial Class II, CE certified, compliant with EN 61000 series anti-interference standards
Communication Bus: Dedicated MRC Link differential bus for Ovation remote I/O racks
Channel Isolation Withstand Voltage: 1000V AC/DC galvanic isolation per independent output channel
Output Signal Standard: 4–20mA DC analog control signal; independent D/A conversion per channel, linear error ≤ ±0.05%FS
On-board Integrated Protections: Surge suppression, overcurrent protection, reverse polarity prevention, short-circuit self-locking protection
Installation Mode: Single-slot hot-swappable plug-in module matched with standard Ovation DCS rack backplane
Quality Warranty: Genuine original Emerson/Westinghouse product, equipped with independent factory inspection test report, 12-month official warranty
Application Fields
Medium and super-large thermal power plant Ovation WDPF distributed control systems, multi-unit integrated petrochemical pipeline regulating valve control cabinets, metallurgical furnace fuel flow actuator control stations, large municipal waste incineration plant combustion air volume regulating systems, pulp & paper factory drying temperature control actuator racks, multi-rack redundant central control rooms of traditional heavy industry, flow, pressure, temperature closed-loop regulation automation platforms for energy & chemical continuous production lines, centralized DCS control systems for large-scale distributed energy storage power stations
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