{"product_id":"1769-ecl-allen-bradley-compact-i-o-datasheet-technical-manual","title":"1769-ECL Allen-Bradley Compact I\/O Datasheet \u0026 Technical Manual","description":"\u003ch2\u003eAllen-Bradley 1769-ECL Compact I\/O Left Bus Terminator\u003c\/h2\u003e\n\u003cp\u003eConfigured for impedance matching within Compact I\/O platforms, the \u003cstrong\u003eAllen-Bradley 1769-ECL\u003c\/strong\u003e (\u003cstrong\u003e1769-ECL\u003c\/strong\u003e Left End Cap \/ Bus Terminator) provides direct physical\/electrical execution. This passive component mounts onto the leftmost edge of a 1769 backplane assembly to close the 5 VDC communication bus loop and suppress signal voltage reflections.\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\u003e1769-ECL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\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\u003e0.06 kg (0.13 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e118 x 87 x 15 mm (4.65 x 3.43 x 0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive component (0 mA backplane current draw)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent Type\u003c\/td\u003e\n\u003ctd\u003eLeft End Cap \/ Bus Terminator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Bus Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Circuitry\u003c\/td\u003e\n\u003ctd\u003ePassive termination resistors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration Resistance\u003c\/td\u003e\n\u003ctd\u003e5 g at 10 to 500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Shock\u003c\/td\u003e\n\u003ctd\u003e30 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication \u0026amp; I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe device functions as the physical and electrical boundary line for the native backplane bus communication velocity. It contains a network of passive matching resistors that maintain transmission line impedance across the full span of the I\/O bank. This structural termination is required to allow stable data packet transfers between the primary controller and remote modules, ensuring that high I\/O density scaling does not distort logic waveforms or generate deterministic network fault frames.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can a CompactLogix 1769 I\/O bank operate reliably if the 1769-ECL is omitted?\u003c\/p\u003e\n\u003cp\u003eA: No. Omitting the terminator leaves the internal 5 VDC signal paths open-ended, causing high-frequency voltage reflections. This electrical degradation results in erratic I\/O behavior, uncorrected data corruption, or immediate \"Bus Fault\" status trips on the main processor.\u003c\/p\u003e\n\u003cp\u003eQ: Does this left bus terminator require a separate firmware flash compatibility check?\u003c\/p\u003e\n\u003cp\u003eA: No. The 1769-ECL contains no active semiconductors, integrated microprocessors, or logic registers. It operates purely as a passive electronic network, making it completely independent of any controller firmware revisions or system software versions.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSlide the terminator directly onto the left side of the last expansion module or power supply interface until the physical alignment tracks mate completely.\u003c\/li\u003e\n\u003cli\u003ePush the integrated mechanical bus lever fully forward into the locked position to engage the internal backplane connector pins.\u003c\/li\u003e\n\u003cli\u003eDo not apply external field wiring, loop power, or ground conductors directly to this unit, as it functions strictly as an internal bus cap.\u003c\/li\u003e\n\u003cli\u003eCheck that a matching 1769-ECR right end cap is installed on the opposite end of the local rack to complete the dual-ended termination baseline.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":42870828171354,"sku":"1769-ECL","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/256..jpg?v=1773017643","url":"https:\/\/www.spareoil.com\/products\/1769-ecl-allen-bradley-compact-i-o-datasheet-technical-manual","provider":"SpareOil Automation","version":"1.0","type":"link"}