{"product_id":"allen-bradley-1756-2ws-controllogix-weigh-scale-module","title":"Allen-Bradley 1756-2WS ControlLogix Weigh Scale Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-2WS ControlLogix Weigh Scale Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-2WS\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-2WS\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDual-Channel Weigh Scale Module, serves as the primary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eControlLogix I\/O module\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilized to execute dual independent strain-gauge signal acquisition across ControlLogix backplane platforms. Configured for load cell excitation and signal digitization in ControlLogix I\/O chassis systems, the module provides direct electrical interface to Wheatstone bridge sensor arrays via two isolated measurement channels.\u003c\/p\u003e\n\u003cp\u003eWithin Allen-Bradley ControlLogix architecture, the module implements deterministic backplane communication with defined 5 VDC and 24 VDC power segmentation, enabling synchronized acquisition from up to eight 350 ohm load cells per channel.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo officially published suffix segmentation exists for 1756-2WS. The identifier represents a fixed ControlLogix dual-channel weigh scale module variant within the 1756 I\/O family.\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\u003e1756-2WS\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.99 lbs\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\u003eBackplane: 5 VDC 1.0 A, 24 VDC 0.0125 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDual-Channel Weigh Scale Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e2 independent channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Cell Support\u003c\/td\u003e\n\u003ctd\u003eUp to 8 × 350 ohm Wheatstone bridge sensors per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Altitude\u003c\/td\u003e\n\u003ctd\u003e1000 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eControlLogix Backplane I\/O Acquisition Behavior\u003c\/h3\u003e\n\u003cp\u003eWithin the ControlLogix backplane architecture, the 1756-2WS performs synchronized analog acquisition using cyclic bus scheduling across the 5 VDC system rail. The module maintains dual-channel isolation logic, allowing independent scaling of strain-gauge bridge inputs without cross-channel interference. Backplane communication is executed via ControlLogix deterministic bus timing, supporting real-time load cell excitation monitoring and digital conversion alignment.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the 1756-2WS support hot-swap insertion in a live ControlLogix rack?\u003c\/strong\u003e\u003cbr\u003eA: Yes, under ControlLogix system rules, the module supports hot-swap, but channel excitation should be disabled at application level before removal to avoid transient load cell excitation drift.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How is backplane current distributed across the module?\u003c\/strong\u003e\u003cbr\u003eA: The module draws 1.0 A from the 5 VDC backplane rail and a minor 0.0125 A from the 24 VDC auxiliary rail, with internal regulation separating signal conditioning and excitation circuitry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can both channels operate independently with different load cell configurations?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Each channel operates as an independent measurement engine with separate Wheatstone bridge excitation and A\/D conversion paths.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure ControlLogix chassis power is fully removed before initial module insertion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify backplane connector seating to avoid intermittent 5 VDC supply contact\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain shield termination at single-point ground near PLC cabinet earth bar\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRoute load cell wiring away from high-frequency switching conductors to reduce excitation noise coupling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eObserve torque and strain relief requirements on strain gauge cable entry points\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure proper channel mapping configuration within ControlLogix Studio prior to energizing load cells\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43568834150490,"sku":"1756-2WS","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-2WS2.jpg?v=1782702109","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-2ws-controllogix-weigh-scale-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}