{"product_id":"ge-wesdac-d20c-remote-terminal-unit-controller","title":"GE WESDAC D20C Remote Terminal Unit Controller","description":"\u003cp\u003eThe \u003cstrong\u003eGE WESDAC D20C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eD20C\u003c\/strong\u003e Remote Terminal Unit Controller, operates as a dedicated hardware component for localized analog data acquisition and discrete control output execution within WESDAC industrial substation automation systems.\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\u003eD20C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE (General Electric \/ Wescom)\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\u003e19\" x 5.25\" x 2.5\" (Standard rack-mount assembly)\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 Requirements\u003c\/td\u003e\n\u003ctd\u003eTypical: 20-60 VDC, 5 W \/ Full Load: 11 W with 24 VDC contact wetting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Hardware\u003c\/td\u003e\n\u003ctd\u003e8-bit Freescale 68HC11 Microprocessing Unit (MPU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock Speed\u003c\/td\u003e\n\u003ctd\u003e2 MHz MPU clock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-Board Memory\u003c\/td\u003e\n\u003ctd\u003e24 KB EPROM, 32 KB static RAM, 512 bytes EEPROM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Inputs\u003c\/td\u003e\n\u003ctd\u003e16 bipolar, differential inputs via plug-in daughter board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA\/D Resolution\u003c\/td\u003e\n\u003ctd\u003e14 bits plus sign\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Rate\u003c\/td\u003e\n\u003ctd\u003e275 ms for 16 inputs @ 60 Hz \/ 328 ms for 16 inputs @ 50 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Outputs\u003c\/td\u003e\n\u003ctd\u003e8 relays plus 2 Master Trip\/Close relays (Configurable Form C loops)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Ratings\u003c\/td\u003e\n\u003ctd\u003e60 W max, 3 A max, 220 VDC max potential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Ratings\u003c\/td\u003e\n\u003ctd\u003e1500 Vrms component isolation \/ 1000 VDC dielectric rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e2 dedicated D.20 Link ports, 1 RS-232 maintenance port (9600 baud)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eGE Industrial Control and Process Coordination\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol and Signal Conversion:\u003c\/strong\u003e The plug-in daughter board utilizes a 14-bit plus sign analog-to-digital converter matrix to interface directly with differential field instruments. Operating with a temperature coefficient of +\/- 10 ppm per deg C, it manages voltage loop conversions at +\/- 0.05% accuracy and current loop arrays at +\/- 0.1% accuracy, sustaining a dynamic range up to 125% of normalized full-scale inputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Integrity Tracking:\u003c\/strong\u003e The control output stage performs automated hardware validation sequences to secure the field relay matrix. The internal logic executes a coil status check every 500 microseconds across the active trip\/close configurations, checking circuit continuity and preventing uncommanded switch operations before verifying programmable pulse timing variables (1 ms to 215 s boundaries).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What physical defense mechanism does the D20C implement to inhibit external control execution during local maintenance windows?\u003c\/p\u003e\n\u003cp\u003eA: The module is equipped with a physical, front-panel local enable\/disable toggle switch. Activating this manual hardware interlock opens a downstream break in the master relay driver circuit, instantly isolating the 8 internal control relays and the 2 Master Trip\/Close coils from remote system execution commands without disrupting the 16 analog input acquisition loops.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module react to common-mode electrical surges running across the differential analog input wiring?\u003c\/p\u003e\n\u003cp\u003eA: The input subsystem relies on an integrated galvanic isolation boundary rated up to 1500 Vrms component isolation and 1000 VDC dielectric resistance. This physical barrier stops high-voltage substation transients from breaching the internal 2 MHz Freescale microprocessor logic, grounding inductive spikes before they can corrupt the active RAM and EEPROM registers.\u003c\/p\u003e","brand":"General Electric","offers":[{"title":"Default Title","offer_id":47894167027902,"sku":"WESDAC D20C","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_16-15-38_80685000-1055-421e-ae8c-c20bd78684f8.png?v=1782722961","url":"https:\/\/www.autooiltech.com\/products\/ge-wesdac-d20c-remote-terminal-unit-controller","provider":"AutoOilTech Limited","version":"1.0","type":"link"}