HI 1771-WS - Single Slot Weigh Scale Module Brochure

The HI 1771-WS has an internaldiagnostics switch, whichtakes the sense and signalload cell lines andconnects them to aninternal resistance. If theweight reading with thisresistance pulled in is stableand repeatable, the inputsection of the module isfunctioning correctly andthe problem is elsewhere.An Auto Zero Trackingfeature allows the moduleto automatically ignore amaterial build-up on theweighing system within anadjustable zero tolerance.Automatically re-zeroingthe module eliminatesdeviations due toaccumulated ingredientbuild-up in the weighvessel or on the scale.WAVERSAVER®The HI 1771-WS Weigh Scale Moduleutilizes Hardy Instruments' industry-proven WAVERSAVER® technology.WAVERSAVER® eliminates the effects ofunwanted plant vibration on a vesselduring weighing by permitting the weighscale module to "see" through theunwanted vibration signals - as low as0.25Hz - while yielding a stable actualweight reading.APPLICATION DATASOFTWAREThe HI 1771-AD Weigh ScaleApplication Data Software contains aDynamic Linked Library (dll) file. Thisfile links the HI 1771-WS withRockwell Software's RSLogix™ 5.0Version 4.0 and provides a graphicinterface for on-line configuration ofthe module. The latest version of thissoftware is downloadable from theHardy Instruments web site.www.hardyinstruments.com • 800-821-5831Model HI 1771-WSApplicationsProcess Weighing:- Batching/Blending- Filling/Dispensing- Level by Weight- Check WeighingFeatures• WAVERSAVER®:Ignores Vibration Onand Around Scales• C2®, Second GenerationCalibration:CalibratesElectronicallyThe Hardy Instruments HI 1771-WSis a single slot weigh scale modulethat mounts in an Allen-Bradley1771 Universal I/O chassis. It readsweight data from strain gage loadsensors and communicates this dataover the I/O chassis backplane toone of Allen-Bradley's PLC-5 familyof Programmable ControllerProcessors. The HI 1771-WS modulereduces installation costs as it needsno external stand-alone scaleinstrument, and provides a wiredcommunications link to the PLC.The HI 1771-WS conditions anddigitizes the weight signal 20 timesper second with over one millioncounts of resolution over adifferential signal range of 0 to30mV. It then transmits the selectableGross, Net and/or Rate-of-Changedata to the processor. This highresolution allows the module totolerate large dead loads andoversizing of the load sensors whileretaining a high level of usableresolution. The module supplies 10Vof DC excitation to drive up to four350 ohm load sensors, or load cells,associated with a single scale. It willsupport additional load cells with anexternal power supply.FEATURESTwo independent firmware set pointsare included that provide controlcapability. Each have a separate preactto compensate for in-flight materialas well as system response delaysalong with a deadband that compen-sates for potential relay chatter.Two bi-color LEDs on the module'sfront panel report its functionalcharacteristics. Calibration can beperformed in traditional ways (hardcal), or by our exclusive C2®, SecondGeneration Calibration, whichenables electronic calibration inseconds without test weights.Weigh Scale Module• Calibration– Electronic (C2®)– Traditional (test weights)• Conversion Rate20 updates per second• CertificationsUL, CSA• Connecting Cable(s)HI 1771-C6, 6ft (1.8m)HI 1771-C10, 10ft (3m)Hardy Instruments3860 Calle FortunadaSan Diego, CA 92123-1825tel. 858-278-2900tel. 800-821-5831fax 858-278-6700www.hardyinstruments.comhardyinfo@hardyinst.comSince 1993HI 1771WS-BSPECIFICATIONS• Power– +5Vdc +/-5% from the 1771 I/O universal chassis– 1,000Vdc minimum isolation from backplane logiccircuirtry• Backplane Current1.5A (maximum)• Inputs– Signal: -0.3mV thru +30.3mV dc– Sense: +/-5V dc +/-5% (10V dc +/-5% differential)– C2®, Second Generation Calibration data• Outputs– Excitation: 10V dc +/-5% 1.5W (maximum)– Set point: 2 independent TTL level drive signals• Common Mode Rejection100dB at or below 60 Hz (minimum)• ResolutionReported: 1:985,000 (for 3mV/V load cell)1:656,000 (for 2mV/V load cell)Internal: 1:1,048,576• Vibration Frequency Rejection0.25 Hz and above in 5 selectable steps• I/O Chassis LocationAny single I/O module slot• Compatible I/O Chassis1771-A1B, -A2B, -A3B, -A3B1, -A4B, 1771-AM1,-AM2• I/O Chassis Keying PositionsBetween 24 and 26Between 32 and 34• I/O Chassis Addressing Mode2-slot, 1-slot, or ½-slot (Note: 8-bit I/O imagedensity)• Weight 1.6 Lbs (0.6kg)• Environmental ConditionsOperating Temperature: 0 to 60°C (32 to140°F)Storage Temperature: -40 to 85°C (-40 to 185°F)• Relative Humidity 5 to 95% (non-condensing)• Weighing ModesNet, Gross, Rate-Of-ChangeOPTIONS• Remote TerminationAssembly (-RT)The weigh scale module'soptional Remote TerminationAssembly providesconnection points betweenthe cable assembly to themodule and the individualwires from the junction boxor load sensor. The RT isdesigned for standard DINmounting rails or standoffs.With an RT configuration,you can replace the weighscale module withoutdisturbing the wiring.• Cables (-C6, -C10)Hardy provides optional cableassemblies from the weighscale module to the remotetermination assembly. Weoffer two lengths for ease ofinstallation: 6 feet (-C6) and10 feet (-C10).COMPONENTS TOCOMPLETE YOURHARDY INSTRUMENTSSYSTEM• Hardy Platform Scales andLoad Points• Hardy C2® Certified Cable• Hardy Junction Box withINTEGRATED TECHNICIAN®(HI 215IT Series)Visit our website to learn moreabout the HI 1771-WS:• full product specifications• ordering information• application notes• technical description• downloadable operator’smanualwww.hardyinst.comor call us: 800-821-5831858-278-2900TYPICAL CONFIGURATIONLoad PointModel HI LPRAPlatformScaleModel HIPS