{"product_id":"1771-qb-c-allen-bradley-linear-positioning-module","title":"1771-QB\/C Allen-Bradley Linear Positioning Module","description":"\u003ch2\u003eAllen-Bradley 1771-QB\/C Linear Positioning Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-QB\/C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-QB\u003c\/strong\u003e Linear Positioning Module, operates as a dedicated hardware component for closed-loop axis positioning control within PLC-5 and 1771 I\/O system platforms. The module processes displacement feedback signals and executes PID and feed-forward control algorithms for hydraulic, pneumatic, and servo actuator control loops.\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\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-QB\/C\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e115 x 317 x 160 mm\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\u003e1.6 A maximum at 5 VDC backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eLinear Positioning Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAxes Supported\u003c\/td\u003e\n\u003ctd\u003e2 independent axes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Rate\u003c\/td\u003e\n\u003ctd\u003e2 ms per axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Algorithms\u003c\/td\u003e\n\u003ctd\u003ePID, feed-forward, acceleration, velocity, derivative control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Output Range\u003c\/td\u003e\n\u003ctd\u003e+\/-10 VDC up to 10 mA; +\/-20 mA up to 600 ohm; +\/-50 mA up to 240 ohm; +\/-100 mA up to 240 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Resolution\u003c\/td\u003e\n\u003ctd\u003e12-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiscrete Outputs\u003c\/td\u003e\n\u003ctd\u003eSourcing type, 100 mA maximum ON, 1.0 mA leakage OFF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiscrete Inputs\u003c\/td\u003e\n\u003ctd\u003e8 mA at 12 VDC; 16 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLogic Input Levels\u003c\/td\u003e\n\u003ctd\u003eLogic 0: 0-4 VDC; Logic 1: 10-30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1.1 A typical at 5 VDC; 1.6 A maximum at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Rating\u003c\/td\u003e\n\u003ctd\u003e3 A, 250 V normal-blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm\u003c\/td\u003e\n\u003ctd\u003e1771-WN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e1771 Universal I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic PLC-5 Motion Control Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1771-QB\/C integrates with PLC-5 control architectures through the 1771 backplane interface and provides closed-loop position control for two independent motion axes. The module supports direct feedback connection from linear displacement transducers including MTS Temposonics, Balluff BTL, and Norstat GYRG devices.\u003c\/p\u003e\n\u003cp\u003eThe module supports industrial control signal processing with I\/O density scaling through configurable analog and discrete channels. The control firmware executes PID and feed-forward calculations with a 2 ms update interval, allowing actuator command updates based on real-time position feedback.\u003c\/p\u003e\n\u003cp\u003eThe module provides analog output interfaces for hydraulic servo valves and servo motor controllers. Built-in diagnostics monitor transducer faults and positioning errors, while simulation modes allow control program verification without physical actuator movement.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many motion axes can the 1771-QB\/C control?\u003cbr\u003eA: The module supports two independent closed-loop positioning axes.\u003c\/p\u003e\n\u003cp\u003eQ: What backplane power requirement does the 1771-QB\/C have?\u003cbr\u003eA: The module requires 5 VDC backplane power with 1.1 A typical current consumption and 1.6 A maximum current consumption.\u003c\/p\u003e\n\u003cp\u003eQ: Which feedback devices can be connected to the 1771-QB\/C?\u003cbr\u003eA: The module supports linear displacement transducers including MTS Temposonics, Balluff BTL, and Norstat GYRG series devices.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-QB\/C in a compatible 1771 Universal I\/O chassis and verify available backplane current capacity before system startup. Use the specified 1771-WN wiring arm for field connections and confirm actuator, transducer, and signal wiring compatibility.\u003c\/p\u003e\n\u003cp\u003eSeparate analog feedback wiring from high-current actuator conductors to reduce electrical interference. Apply shield grounding practices according to cabinet grounding design, with cable shields terminated using appropriate industrial methods.\u003c\/p\u003e\n\u003cp\u003eVerify transducer scaling, feedback polarity, and actuator output configuration during commissioning. Ensure hydraulic, pneumatic, or servo drive hardware is mechanically aligned before enabling closed-loop control.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43700874412122,"sku":"1771-QB\/C","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-QBC2.jpg?v=1784701082","url":"https:\/\/www.plcmasters.com\/products\/1771-qb-c-allen-bradley-linear-positioning-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}