{"product_id":"ge-wesdac-d20a-analog-scan-module","title":"GE WESDAC D20A Analog Scan Module","description":"\u003cp\u003eThe \u003cstrong\u003eGE Fanuc WESDAC D20A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eD20A\u003c\/strong\u003e Analog Scan Module, operates as a dedicated hardware component for converting physical analog sensor variables into digital data registers within WESDAC industrial automation platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eD20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE Fanuc (General Electric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eWESDAC \/ D20 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States (US)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eStandard WESDAC rack-slot allocation metrics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard VME\/WESDAC format plug-in module profile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 deg C (-4 to +140 deg F) standard engineering envelope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSourced via local chassis backplane interface lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Inputs\u003c\/td\u003e\n\u003ctd\u003e32 discrete analog input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Types\u003c\/td\u003e\n\u003ctd\u003eAccepts both DC voltage and DC current signals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003eHigh-resolution analog-to-digital (A\/D) conversion matrix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003eDNP3 (Distributed Network Protocol) and GE D.20 Link architecture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical Layout\u003c\/td\u003e\n\u003ctd\u003eModular design configuration with detachable terminal units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eGE Fanuc Industrial Control and Signal Processing\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel-to-Channel Isolation Matrix:\u003c\/strong\u003e The D20A module incorporates internal galvanic isolation barriers between the external 32 analog inputs and the internal logic processing components. This layout isolates high-voltage ground spikes and common-mode noise on individual field lines, keeping raw electrical transients from bleeding into adjacent registers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Junction Compensation (CJC):\u003c\/strong\u003e When interfacing with millivolt or current loops routed through detachable terminal blocks, the hardware runs continuous ambient thermal tracking routines. This internal compensation step stabilizes signal calibration drift caused by temperature swings in the surrounding panel enclosure, ensuring precise analog-to-digital conversion factors across all 32 channels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the detachable terminal units of the D20A module be removed while the analog loops are under active load?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the physical separation of the front-facing terminal blocks is designed to support offline field service without disturbing the main rack backplane. However, uncoupling the terminal block during an active loop scan will instantly break the current loops, causing upstream instrumentation tracking faults and injecting zero-scale values into the local DNP3 database registers.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module handle a combination of both voltage and current signals across its 32 input channels?\u003c\/p\u003e\n\u003cp\u003eA: The input circuitry uses hardware-selectable jumpers or dip-switch arrays located on the internal printed circuit board to establish individual channel parameters. For current signals (e.g., 4-20 mA), configuring the jumper introduces a precision low-impedance shunt resistor across the terminal inputs to drop the current loop down to a measurable voltage potential before A\/D processing.\u003c\/p\u003e","brand":"General Electric","offers":[{"title":"Default Title","offer_id":47894166732990,"sku":"WESDAC D20A","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-29_16-10-30_10349bfc-99d2-4dc3-a2e2-7787cc95e843.png?v=1782722929","url":"https:\/\/www.autooiltech.com\/ar\/products\/ge-wesdac-d20a-analog-scan-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}