{"product_id":"allen-bradley-1746sc-ctr4-counter-flowmeter-input-module","title":"Allen-Bradley 1746sc-CTR4 Counter \/ Flowmeter Input Module","description":"\u003ch1\u003eAllen-Bradley 1746sc-CTR4 Counter \/ Flowmeter Input Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for high-speed pulse acquisition in SLC 500 backplane signal processing, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746sc-CTR4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1746sc-CTR4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCounter \/ Flowmeter Input Module) provides direct electrical execution of quadrature decoding, differential counting, and enable-line gating across SLC 500 chassis architectures. The module digitizes AC or DC pulse trains into binary count and rate values via four isolated input channels.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\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\u003e1746sc-CTR4\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\u003e0.38 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eSingle slot SLC module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.75 W max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e225 mA @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003eAC 50 mV to 75 V peak; 5 VDC, 12 VDC, 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Frequency\u003c\/td\u003e\n\u003ctd\u003eDC\/AC up to 50 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e4 differential counter inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuadrature Inputs\u003c\/td\u003e\n\u003ctd\u003e2 channels supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnable Inputs\u003c\/td\u003e\n\u003ctd\u003e2 control lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e25 kOhms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCount Range\u003c\/td\u003e\n\u003ctd\u003e-32,768 to +32,767 \/ -8,388,608 to +8,388,607\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Time\u003c\/td\u003e\n\u003ctd\u003e4 ms per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Options\u003c\/td\u003e\n\u003ctd\u003eDigital 50 kHz \/ 30 kHz; Analog 15 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eHigh-Speed Counting and Signal Conditioning Architecture\u003c\/h3\u003e\n\u003cp\u003eThe module implements multi-mode pulse conditioning for AC and DC input domains. Signal acquisition stages accept wide amplitude variations from low-level millivolt AC signals up to 75 V peak, followed by threshold conversion into TTL-compatible logic states for backplane processing.\u003c\/p\u003e\n\u003cp\u003eQuadrature decoding logic resolves phase-shifted A\/B encoder inputs into directional count increments. Enable control lines gate counter execution at hardware level prior to backplane transfer. Internal filtering paths allow selectable bandwidth limitation to suppress high-frequency noise components above configured cutoff.\u003c\/p\u003e\n\u003cp\u003eCount accumulation engine supports both low-range signed binary mode and extended high-range accumulation mode. Overflow and underflow conditions are exposed through status bits for diagnostic polling via SLC processor scan cycle.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the module support hot-swap during active counting?\u003cbr\u003eA: The module is not intended for insertion or removal under active backplane power. Removal interrupts counter data acquisition and resets internal accumulation registers.\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane load during full channel operation?\u003cbr\u003eA: Maximum backplane consumption is specified at 225 mA @ 5 VDC, independent of input channel utilization state.\u003c\/p\u003e\n\u003cp\u003eQ: Can quadrature inputs and differential counter inputs run simultaneously?\u003cbr\u003eA: Yes. Channel allocation supports concurrent operation of differential, quadrature, and enable lines, with per-channel update scheduling at 4 ms resolution.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eModule insertion must be performed in an SLC 500 chassis slot with backplane power disabled. Input wiring shall maintain separation between low-level encoder signals and high-voltage AC pulse sources to avoid threshold corruption. Shield termination shall be grounded at one end only to prevent ground loop induced counting errors. For quadrature encoder inputs, A\/B phase wiring length should be matched to reduce propagation skew at high frequency operation near 50 kHz.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43537476190298,"sku":"1746SC-CTR4","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746SC-CTR42.jpg?v=1782201034","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746sc-ctr4-counter-flowmeter-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}