{"product_id":"allen-bradley-1746sc-ctr8-counter-flow-meter-module","title":"Allen-Bradley 1746sc-CTR8 Counter \/ Flow Meter Module","description":"\u003ch1\u003eAllen-Bradley 1746sc-CTR8 Counter \/ Flow Meter Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for multi-channel pulse acquisition in SLC 500 backplane counting architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746sc-CTR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1746sc-CTR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCounter \/ Flow Meter Module) provides direct electrical execution of high-speed frequency capture, quadrature-compatible counting, and flow pulse accumulation across eight independent input channels within SLC 500 chassis systems.\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-CTR8\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\u003e1.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eSingle slot module\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\u003eNot explicitly specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e8 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e5 VDC to 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Frequency\u003c\/td\u003e\n\u003ctd\u003eUp to 50 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Isolation\u003c\/td\u003e\n\u003ctd\u003e1000 VDC channel to backplane\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\u003eChannel Update Time\u003c\/td\u003e\n\u003ctd\u003e4 ms per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Consumption\u003c\/td\u003e\n\u003ctd\u003e225 mA @ 5 VDC; 125 mA @ 24 VDC\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eMulti-Channel High-Speed Counting Architecture\u003c\/h3\u003e\n\u003cp\u003eThe module implements eight independent acquisition paths for pulse and frequency signals, supporting both low-voltage logic-level inputs and higher amplitude field signals up to 24 VDC. Each channel includes signal conditioning stages with defined impedance matching at 25 kOhms to stabilize edge detection under varying source characteristics.\u003c\/p\u003e\n\u003cp\u003eBackplane transfer is isolated from field-side acquisition through 1000 VDC channel-to-backplane dielectric separation. This structure prevents transient propagation from input wiring into SLC 500 logic rails during switching events or high-frequency burst conditions.\u003c\/p\u003e\n\u003cp\u003eEach channel operates on a fixed 4 ms update cycle, decoupling input sampling from backplane scan timing. This enables deterministic aggregation of turbine flowmeter pulses and encoder-derived signals at up to 50 kHz per channel.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can all 8 channels operate simultaneously at 50 kHz input frequency?\u003cbr\u003eA: Yes. Each channel has an independent acquisition path, but total system load must remain within backplane current limits of the SLC chassis.\u003c\/p\u003e\n\u003cp\u003eQ: What happens if input voltage exceeds 24 VDC?\u003cbr\u003eA: Input conditioning is rated up to 24 VDC nominal. Exceeding the specified range may cause input stage saturation and invalid count registration.\u003c\/p\u003e\n\u003cp\u003eQ: Does channel isolation prevent cross-channel interference?\u003cbr\u003eA: Channels are independently conditioned, but isolation is specified against backplane coupling at 1000 VDC, not full inter-channel galvanic isolation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eModule insertion must be performed with SLC 500 chassis power removed. Field wiring should maintain separation between high-frequency pulse lines and power conductors to reduce induced noise on threshold detection circuits. Shield termination should be applied at a single grounding point to avoid circulating ground currents across encoder or turbine flowmeter wiring. Wire gauge selection must remain within terminal limits (12 AWG to 28 AWG) to ensure stable mechanical termination under vibration conditions.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43537488904282,"sku":"1746SC-CTR8","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746SC-CTR82.jpg?v=1782201402","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746sc-ctr8-counter-flow-meter-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}