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HI1771-WS - Single Slot Weigh Scale Module

HI1771-WS - Single Slot Weigh Scale Module

The Hardy Process Solutions HI 1771-WS is a single slot weigh scale module that mounts in an Allen-Bradley 1771 Universal I/O chassis. It reads weight data from strain gage load sensors and communicates this data over the I/O chassis backplane to one of Allen-Bradley's PLC-5 family of Programmable Controller Processors. The HI 1771-WS module reduces installation costs as it needs no external stand-alone scale instrument, and provides a wired communications link to the PLC.

Or call 858.278.2900 for assistance

OBSOLETE, NO LONGER AVAILABLE

Note: The HI 1771WS is a legacy product that is no longer available. This page is provided for users who may need to access the Installation and Operations manual and any software updates.

Support for Allen-Bradley PLC5

The Hardy Process Solutions HI 1771-WS is a single slot weigh scale module that mounts in an Allen-Bradley 1771 Universal I/O chassis. It reads weight data from strain gage load sensors and communicates this data over the I/O chassis backplane to one of Allen-Bradley's PLC-5 family of Programmable Controller Processors. The HI 1771-WS module reduces installation costs as it needs no external stand-alone scale instrument, and provides a wired communications link to the PLC.

The HI 1771-WS conditions and digitizes the weight signal 20 times per second with over one million counts of resolution over a differential signal range of 0 to 30mV. It then transmits the selectable Gross, Net, and/or Rate-of-Change data to the processor. This high resolution allows the module to tolerate large dead loads and oversizing of the load sensors while retaining a high level of usable resolution. The module supplies 10V of DC excitation to drive up to four 350 ohm load sensors, or load cells, associated with a single scale. It will support additional load cells with an external power supply.

FEATURES

Two independent firmware set points are included that provide control capability. Each have a separate preact to compensate for in-flight material as well as system response delays along with a deadband that compensates for potential relay chatter.

Two bi-color LEDs on the module's front panel report its functional characteristics. Calibration can be performed in traditional ways (hard cal), or by our exclusive C2®, Second Generation Calibration, which enables electronic calibration in seconds without test weights.

Power

  • +5Vdc +/-5% from the 1771 I/O universal chassis
  • 1,000Vdc minimum isolation from backplane logic circuitry

Backplane Current

  • 1.5A (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 Rejection

  • 100dB at or below 60 Hz (minimum)

Resolution

  • Reported: 1:985,000 (for 3mV/V load cell)
  • 1:656,000 (for 2mV/V load cell)
  • Internal: 1:1,048,576

Vibration Frequency Rejection

  • 0.25 Hz and above in 5 selectable steps

I/O Chassis Location

  • Any single I/O module slot

Compatible I/O Chassis

  • 1771-A1B, -A2B, -A3B, -A3B1, -A4B, 1771-AM1,AM2

I/O Chassis Keying Positions

  • Between 24 and 26
  • Between 32 and 34

I/O Chassis Addressing Mode

  • 2-slot, 1-slot, or ½-slot (Note: 8-bit I/O image density)

Weight

  • 1.6 lbs (0.6kg)

Environmental Conditions

  • Operating 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 Modes

  • Net, Gross, Rate-Of-Change