{"product_id":"1771-ws-allen-bradley-weigh-scale-module-new-original-stock","title":"1771-WS Allen-Bradley Weigh Scale Module | New \u0026 Original Stock","description":"\u003ch2\u003eAllen-Bradley 1771-WS PLC-5 Weigh Scale Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-WS\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-WS\u003c\/strong\u003e Weigh Scale Module, operates as a dedicated hardware component for converting load cell signals into accurate digital weight data within PLC-5 I\/O chassis platforms.\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\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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-WS\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\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eWeigh Scale Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e1 channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Cell Compatibility\u003c\/td\u003e\n\u003ctd\u003eUp to 4 x 350 ohm full Wheatstone bridge load cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcitation Voltage\u003c\/td\u003e\n\u003ctd\u003e10 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Range\u003c\/td\u003e\n\u003ctd\u003e0 to 30 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Power\u003c\/td\u003e\n\u003ctd\u003e5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.2 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 VAC for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Mode Rejection\u003c\/td\u003e\n\u003ctd\u003e100 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B, 1771-AM1, 1771-AM2\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\u003eStorage Temp\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\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e178 x 50 x 180 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.57 kg (1.25 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe 1771-WS leverages the native Allen-Bradley 1771 backplane bus communication velocity to execute deterministic block transfer reads (BTR) and block transfer writes (BTW) directly interfacing with the PLC-5 processor. This localized processing model ensures high-speed I\/O density scaling by offloading the complex 16-bit analog-to-digital weight calculation parameters from the primary CPU. Firmware flash compatibility restrictions apply based on the series revision, maintaining stable communication profiles across legacy 1771 universal I\/O chassis architectures without degrading backplane network bandwidth.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the maximum number of load cells that can be driven by a single 1771-WS module?\u003c\/p\u003e\n\u003cp\u003eA: The internal excitation power supply of the module delivers 10 VDC and is rated to drive up to four parallel 350 ohm full Wheatstone bridge load cells simultaneously.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1771-WS support hot-swapping while the 1771 I\/O chassis backplane is energized?\u003c\/p\u003e\n\u003cp\u003eA: No. The 1771 architecture requires the chassis power supply to be fully de-energized prior to inserting or removing the module to prevent transient electrical damage or disruption to backplane communications.\u003c\/p\u003e\n\u003cp\u003eQ: How is calibration data retained if backplane power is lost?\u003c\/p\u003e\n\u003cp\u003eA: Calibration parameters, including zero and span targets, are transmitted via block transfer writes from the PLC-5 processor logic and stored in non-volatile memory or managed directly via the controller application code upon system initialization.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Alignment and Keying:\u003c\/strong\u003e Ensure the plastic keying bands on the 1771 chassis backplane connector match the designated slot positioning for the 1771-WS module to prevent incorrect hardware insertion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding and Grounding:\u003c\/strong\u003e Terminate all load cell cable shields at a single, clean instrumentation ground point. Do not ground the shield at both ends to prevent the formation of ground loops that inject electrical noise into the 0 to 30 mV analog signal line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Separation:\u003c\/strong\u003e Route low-voltage load cell signal wiring through dedicated conduit paths separated from high-voltage AC power lines or variable frequency drive (VFD) motor cables by a minimum distance of 300 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Block Engagement:\u003c\/strong\u003e Verify that the field wiring arm is fully seated and securely latched onto the module frame prior to system power-up.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43425778827354,"sku":"1771-WS","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/189._1bbc1c74-33a4-43d2-84e3-ae62413d52ac.jpg?v=1779934814","url":"https:\/\/www.spareoil.com\/products\/1771-ws-allen-bradley-weigh-scale-module-new-original-stock","provider":"SpareOil Automation","version":"1.0","type":"link"}