{"product_id":"ge-westermd20c-i-o-module","title":"GE WESTERMD20C  I\/O Module","description":"\u003cp\u003eServes as the primary \u003cstrong\u003eGE WESDAC D20C\u003c\/strong\u003e I\/O Module utilized to execute digital and analog field signal processing across GE D20 RTU automation platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe D20C system consists of a two-part hardware architecture comprising a main processing module paired with a dedicated termination assembly:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWESDAC D20C\u003c\/strong\u003e: Main electronics module featuring the 68HC11 MPU, memory, and optional analog daughterboards for data processing and D.20 Link communication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWESTERM D20C\u003c\/strong\u003e: Detachable terminal panel dedicated to physical field wiring termination and interposing relay interface routing.\u003c\/li\u003e\n\u003c\/ul\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\u003eWESDAC D20C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 1.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard D20 Subrack Slot Card\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSubrack Backplane \/ D.20 Link Bus Powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003e8-bit Freescale 68HC11 MPU @ 2 MHz\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\u003eDigital Inputs\u003c\/td\u003e\n\u003ctd\u003e16 Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Outputs\u003c\/td\u003e\n\u003ctd\u003e8 Momentary or Dual-Function Relay Outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Daughterboard 1\u003c\/td\u003e\n\u003ctd\u003e16 Analog Inputs (Bipolar, Differential, 14-bit plus sign resolution)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Daughterboard 2\u003c\/td\u003e\n\u003ctd\u003e8 Analog Inputs and 8 Analog Outputs (Unipolar\/Bipolar, 12-bit plus sign resolution)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Input Conversion\u003c\/td\u003e\n\u003ctd\u003e275 ms (16 channels @ 60 Hz), 328 ms (16 channels @ 50 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Interfaces\u003c\/td\u003e\n\u003ctd\u003e2x DB9 D.20 Link Daisy-Chain Ports, 1x DB9 WESMAINT D20 Maintenance Port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus \u0026amp; Deterministic Network Scaling\u003c\/h3\u003e\n\u003cp\u003eThe WESDAC D20C employs dual DB9 serial interface connections to execute high-speed D.20 Link communications across distributed controller racks. Internal processing offloads loop scanning from the central D20 main processor using an on-board 68HC11 microcontroller running at 2 MHz clock speed. The module processes 16-channel analog updates within 275 ms (at 60 Hz filtering) and executes local I\/O density scaling with 95 dB common-mode noise rejection, maintaining deterministic data delivery over internal bus topographies.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is local maintenance performed on the WESDAC D20C without interrupting backplane serial traffic?\u003c\/p\u003e\n\u003cp\u003eA: The card features a dedicated DB9 WESMAINT port on the front panel, allowing direct ASCII terminal access for diagnostics while maintaining active polling on the secondary D.20 Link daisy-chain ports.\u003c\/p\u003e\n\u003cp\u003eQ: What is the purpose of the Local\/Remote switch located on the front panel of the module?\u003c\/p\u003e\n\u003cp\u003eA: The Local\/Remote toggle switch isolates relay coil power output circuits during maintenance, preventing accidental field tripping while providing module status feedback to the host controller.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the WESTERM D20C termination panel into the rear rack rails prior to inserting the WESDAC D20C active processing card.\u003c\/li\u003e\n\u003cli\u003eVerify all field signal wiring is de-energized before connecting wires to the terminal blocks.\u003c\/li\u003e\n\u003cli\u003eEnsure the DB9 serial daisy-chain cables for the D.20 Link are securely fastened using thumbscrews to prevent intermittent bus loss.\u003c\/li\u003e\n\u003cli\u003eGround all analog input shield wires at one end only to the designated chassis ground stud on the WESTERM panel.\u003c\/li\u003e\n\u003cli\u003eSet the Local\/Remote switch to \"Local\" during wiring installation to suppress control output activation.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"General Electric","offers":[{"title":"Default Title","offer_id":48747734368446,"sku":"WESTERMD20C","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/WESTERMD20C_3b1a82ce-c5dd-452f-8cd2-bc85d453d14c.png?v=1786963341","url":"https:\/\/www.autooiltech.com\/products\/ge-westermd20c-i-o-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}