Allen Bradley HI 1756-2WS /B HARDY INSTRUMENTS Dual Channel Weigh

Product Specification

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1756-2WS

Both the HI 1756-WS and HI 1756-2WS Weigh Scale Modules are self-contained, microprocessor-based ControlLogix I/O modules with control inputs and outputs that plug into the backplane of an AB ControLogix® programmable controller and/or Remote Rack. The remote rack module connects to the local chassis via a ControlNet link. NOTE: The AB Control/Logix®manuals contain useful information about their products that is not provided in this manual. This manual assumes that users have a basic understanding of process control and can interpret ladder logic instructions as needed to generate the electronic signals that control their application(s). The HI 1756-WS Weigh Scale Module Series A is configured for single-channel operation while the HI 1756-2WS Weigh Scale Module Series A is configured for dual-channel operation. Both modules can be used for a wide variety of process weighing applications such as batching, blending, filling/dispensing, check weighing, force measurement, level by weight and weight rate monitoring. The analog-to-digital converter in the weigh module controller updates fifty times per second and is capable of 8,388,608 counts of display resolution. This is enough to provide accurate weight measurement and control and to tolerate large “dead” loads or over sizing of load cells/sensors. To calibrate the module you can simply push “The Button” to effect a C2 electronic calibration. C2, Hard (Traditional calibration with weights) is also available for those not using Hardy Instruments C2 certified load sensors.

During the measurement of small weight changes, the affects of mechanical vibration and noise from the operating environment can introduce substantial interference. WAVERSAVER factors out vibration, noise, and other interference-related signals from the load cell so the rate controller can better decipher the actual weight data. WAVERSAVER® can be configured to ignore noise with frequencies as low as 0.25 Hz. One of five higher additional cut off frequencies may be selected to provide a faster instrument response time. The default factory configuration is 1.00 Hz vibration frequency immunity. C2® Calibration Traditional calibration uses certified test weights. C2® Electronic Calibration allows a scale to be calibrated without the need for test weights. It can be initiated by pressing “THE BUTTON®” located in the front of the module, or via ladder logic. A C2 weighing system consists of up to eight C2 load sensors, a junction box, interconnect cable, and an instrument with C2 capabilities (e.g., the HI 1756). Each Hardy Instruments C2-certified load sensor outputs digital information used for the calibration. The modules reads the sensor outputs and detects the number of active sensors. It then calibrates the scale based on the load sensor’s output plus a user-supplied reference point value (from 0 to any known weight on the scale).

Hardy Part # -RTA (HI-1756-XX-RTA if ordered separately) Remote Termination supports two (2) separate HI 1756-WS weigh scale modules or one (1) HI 1756-2WS weigh scale module. Unit includes DIN rail mounting for 35mm x 15mm DIN rail.

Hardy Part # -C6 (HI 1756-XX-C6) • Cable Length: 6 ft. (1.525 meters) from the single channel module to the RTA. Hardy Part # -C6 (HI 1756-XX-DC6) • Cable Length: 6 ft. (1.525 meters) from the dual channel module to the RTA.

NEMA rated waterproof enclosure which sums from one to four load sensors load sensors. • -PS1 NEMA 4 Painted Steel • -SS1 NEMA 4X Stainless Steel • -FG1 NEMA 4X Fiberglass

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