{"product_id":"1771-ixhr-allen-bradley-high-resolution-tc-mv-analog-input-module-plc-5","title":"1771-IXHR Allen-Bradley High Resolution TC\/mV Analog Input Module PLC-5","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-IXHR\/C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IXHR\u003c\/strong\u003e High Resolution Thermocouple\/Millivolt Analog Input Module, samples 8 floating differential field sensors and moves converted words into the PLC-5 data table over the 1771 backplane.\u003c\/p\u003e\n\u003ch3\u003eCatalog Identity and Revision Cross-Reference\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMarking\u003c\/th\u003e\n\u003cth\u003eDefinition\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1771-IXHR\u003c\/td\u003e\n\u003ctd\u003eBase catalog number, 8-point high-resolution TC\/mV input, PLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1771-IXHR\/A\u003c\/td\u003e\n\u003ctd\u003eRevision A hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1771-IXHR\/B\u003c\/td\u003e\n\u003ctd\u003eRevision B hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1771-IXHR\/C\u003c\/td\u003e\n\u003ctd\u003eRevision C hardware, latest shipped before discontinuation in May 2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1771IXHR\u003c\/td\u003e\n\u003ctd\u003eNon-hyphenated BOM \/ nameplate string\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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\u003e1771-IXHR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.68 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e3.1 x 14.6 x 25.4 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Class\u003c\/td\u003e\n\u003ctd\u003e1771 PLC-5 high-resolution analog input, single-slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e8 floating differential inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Signals\u003c\/td\u003e\n\u003ctd\u003eTypes B, E, J, K, T, R, S thermocouples; +\/-100 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Grouping\u003c\/td\u003e\n\u003ctd\u003e8 identical type, or 4 + 4 of two types maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Resolution\u003c\/td\u003e\n\u003ctd\u003e15 bit + sign; 0.1 deg C \/ 0.1 deg F per bit; 1 uV mV resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCold Junction Compensation\u003c\/td\u003e\n\u003ctd\u003e0-60 deg C range, +\/-0.5 deg C accuracy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e750 mA at 5 VDC from 1771 chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Field Power\u003c\/td\u003e\n\u003ctd\u003eNot required for signal conversion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Update Time\u003c\/td\u003e\n\u003ctd\u003e25 ms per 8 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Power Dissipation\u003c\/td\u003e\n\u003ctd\u003e4.255 W (14.5 BTU\/hr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Transfer\u003c\/td\u003e\n\u003ctd\u003eBlock transfer programming, natural binary words\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Interface\u003c\/td\u003e\n\u003ctd\u003e1771-WI field wiring arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C ambient, chassis mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e1771 I\/O rack, keying strip pins 20-22 and 24-26\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus\u003c\/td\u003e\n\u003ctd\u003eDiscontinued by manufacturer, May 2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTariff Code\u003c\/td\u003e\n\u003ctd\u003e8538907080\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBlock Transfer and Backplane I\/O Density Budget\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IXHR does not stream data through the normal discrete I\/O image; it uses block transfer read\/write blocks executed by the PLC-5 processor to move configuration words and converted analog results across the 1771 parallel backplane. Backplane bus communication velocity licences are not present on 1771 analog hardware; effective sample rate is bounded by the 25 ms\/8-channel conversion cadence and the processor block-transfer queue occupancy. I\/O density scaling in one chassis is limited by the 750 mA 5 VDC draw of this module added to the sum of all installed module backplane loads against the 1771 power supply rating. No field-flashable firmware resides in 1771-IXHR; revision A\/B\/C differences are handled by electronic keying through the I\/O configuration file and the module ID resistor\/keying comb. Replacement across revisions is accepted only when keying is set to compatible or disabled.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x 1771-IXHR module (base unit, revision A\/B\/C subject to available NOS stock)\u003c\/li\u003e\n\u003cli\u003e1 x 1771-WI removable field wiring arm, where not already panel-mounted\u003c\/li\u003e\n\u003cli\u003e1 x Pre-seated chassis keying strip for 1771-IXHR slot acceptance\u003c\/li\u003e\n\u003cli\u003e1 x Module installation data sheet \/ block-transfer register map insert\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRack and Sensor Wiring Practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRemove 1771 chassis 5 VDC backplane power before insertion or extraction; module is not hot-swappable\u003c\/li\u003e\n\u003cli\u003eConnect thermocouple extension wire of matching alloy to the 1771-WI terminal pairs; do not substitute copper for TC legs inside the cabinet\u003c\/li\u003e\n\u003cli\u003eRoute mV-source signal pairs as twisted, shielded cable; terminate shield drain at the 1771-WI ground lug only\u003c\/li\u003e\n\u003cli\u003eKeep TC\/mV input runs separated from 120 VAC, 24 VDC solenoid, and VFD output trays to preserve microvolt-level CJC accuracy\u003c\/li\u003e\n\u003cli\u003eVerify CJC sensor area on module face is not insulated by tape or painted panel door during commissioning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Questions and Answers\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs 1771-IXHR hot-swappable in a live PLC-5 rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The module draws 750 mA at 5 VDC from the backplane and carries live differential input front-end circuitry. Insertion or removal under power can arc the backplane connector and force a chassis major fault. De-energize rack before swap.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if cold junction compensation sensor drifts?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCJC error adds linearly to every converted TC channel while mV channels are less affected. Within 0-60 deg C ambient the stated CJC accuracy is +\/-0.5 deg C; outside that band, TC readings retain 1 uV\/mV conversion integrity but lose the published TC accuracy claim.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan 1771-IXHR\/C replace a failed 1771-IXHR\/A without program edit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf PLC-5 I\/O configuration keying is exact, replacement with a different revision trips a fault on power-up. Set keying to compatible or disable it, then download; data-table mapping and block-transfer file numbers remain unchanged across A\/B\/C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre all 8 inputs galvanically isolated from each other?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 8 inputs are floating differential pairs referred to a common analog-front-end bus inside the module, with isolation existing primarily between field side and 5 VDC backplane logic. Do not land potentials from separately grounded sensor networks without checking common-mode limits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the module need no external 24 VDC for TC input?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThermocouple and low-level mV conversion is powered entirely from the 5 VDC 1771 backplane rail, which supplies the 750 mA load. Only the sensor loop continuity matters; no transmitter excitation is sourced by 1771-IXHR itself.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the consequence of a thermocouple open circuit in run?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe channel reports an open-circuit fault condition and the FLT LED illuminates if enabled in the configuration word. The remaining seven channels keep updating on their 25 ms scan; the faulted word does not hold last good value unless the application program latches it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many 1771-IXHR modules fit in one 1771-A2B 8-slot rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBackplane current, not slot count, governs loading. With a typical 8 A 5 VDC supply, allow 750 mA per 1771-IXHR plus the processor\/adapter and any digital I\/O; three 1771-IXHR modules already consume 2.25 A before any discrete modules are added.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes loss of 5 VDC backplane freeze the last analog values?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Loss of backplane power removes the A\/D supply and block-transfer handshake. All eight input words stop updating immediately and the RUN LED extinguishes; restored power reinitializes auto-calibration before valid conversions resume.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066443616429,"sku":"1771-IXHR","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/allen-bradley_1771-ixhr.jpg?v=1786891021","url":"https:\/\/www.maxwellplc.com\/products\/1771-ixhr-allen-bradley-high-resolution-tc-mv-analog-input-module-plc-5","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}