{"product_id":"ge-wesdac-d20c-d20-rtu-combination-i-o-board-68hc11","title":"GE WESDAC D20C D20 RTU Combination I\/O Board 68HC11","description":"\u003ch2\u003eGE WESDAC D20C D20 Substation Automation I\/O Board\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGE WESDAC D20C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eWESDAC D20C\u003c\/strong\u003e Analog Digital I\/O Module, operates as a dedicated hardware component for distributed signal acquisition and local logic execution within GE D20 and D200 Remote Terminal Unit (RTU) platforms. The module consists of a WESTERM D20C field termination board and a WESDAC D20C processing board powered by an 8-bit Freescale 68HC11 MPU. Utilizing dual D.20 Link ports, the unit offloads signal conditioning, noise filtering, and trip\/close control execution from the primary D20 CPU.\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\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\u003e1.542 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e19 in x 5.25 in x 2.5 in (3U Rack-Mount Form Factor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e20 to 60 VDC (5 W Typical \/ 11 W Full Load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor \u0026amp; Memory\u003c\/td\u003e\n\u003ctd\u003e8-bit Freescale 68HC11 MPU (2 MHz), 24 KB EPROM, 32 KB SRAM, 512 B EEPROM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Inputs\u003c\/td\u003e\n\u003ctd\u003e16 discrete inputs (12 to 130 VDC range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Outputs\u003c\/td\u003e\n\u003ctd\u003e8 Form C contacts (3 A max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Analog I\/O\u003c\/td\u003e\n\u003ctd\u003e16 inputs (+\/- 35 VDC, 14-bit) OR 8 inputs + 8 outputs (4-20 mA, 12-bit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Isolation\u003c\/td\u003e\n\u003ctd\u003e1500 VAC Field-to-Backplane Isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interfaces\u003c\/td\u003e\n\u003ctd\u003eDual Redundant D.20 Link Ports, RS-232 Maintenance Port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus TCP\/IP, SRTP, DNP3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and System Determinism\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eGE WESDAC D20C\u003c\/strong\u003e module interfaces directly with the GE D20 backplane architecture to ensure rapid data exchange across distributed sub-networks. By executing input scanning and filtering locally, the card manages I\/O density scaling efficiently while reducing protocol conversion latencies over the dual D.20 Link ports. Onboard firmware flash compatibility across D20 processor nodes maintains deterministic communications during high-volume event logging and protective tripping operations.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the two-component design simplify module replacement during live operations?\u003c\/p\u003e\n\u003cp\u003eA: The detachable WESTERM D20C termination board remains permanently connected to the cabinet field wiring, allowing engineers to hot-swap the primary WESDAC D20C processing board without disturbing physical terminal blocks or risk rewiring errors.\u003c\/p\u003e\n\u003cp\u003eQ: What power supply range does the module require, and how is the backplane isolated?\u003c\/p\u003e\n\u003cp\u003eA: The module accepts a wide input power supply range from 20 to 60 VDC and features 1500 VAC galvanic isolation between field-side signal lines and the internal D20 backplane logic circuits.\u003c\/p\u003e\n\u003cp\u003eQ: How do the dual D.20 Link communication ports handle network fault recovery?\u003c\/p\u003e\n\u003cp\u003eA: The dual D.20 Link ports support redundant cabling topologies, enabling immediate, deterministic packet re-routing over the secondary link if a primary communication cable experiences an open circuit or signal degradation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eObserve the following field installation practices during cabinet integration and commissioning:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Isolation \u0026amp; Verification\u003c\/strong\u003e: Verify that input DC power to the rack chassis is within 20 to 60 VDC before seating the card into the 3U sub-rack enclosure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination Board Mounting\u003c\/strong\u003e: Secure the WESTERM D20C termination base to the mounting frame first, ensuring firm earth ground bonding to maintain 1500 VAC field-to-backplane isolation integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eESD \u0026amp; Module Alignment\u003c\/strong\u003e: Wear a grounded ESD wrist strap, align the processing card with the chassis card guides, and push evenly until the edge connectors engage the backplane. Tighten retaining thumbscrews.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Wiring \u0026amp; Shield Grounding\u003c\/strong\u003e: Strip field conductors to recommended lengths, securing 12 to 130 VDC discrete input and 4-20 mA analog wiring to screw terminals. Terminate all cable shields to the main cabinet ground bus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal \u0026amp; Clearance Spacing\u003c\/strong\u003e: Maintain a minimum 50 mm clearance above and below the 3U rack assembly to allow unhindered vertical convection, ensuring ambient air remains within the -40 to +70 deg C operating window.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"GE Fanuc","offers":[{"title":"Default Title","offer_id":43871112724579,"sku":"WESDAC D20C","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/361._3812f23a-3a58-4a90-875e-898b0234fbfb.jpg?v=1764836393","url":"https:\/\/www.autocontrolglobal.com\/products\/ge-wesdac-d20c-d20-rtu-combination-i-o-board-68hc11","provider":"AutoControl Global","version":"1.0","type":"link"}