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