Hard calibration, Hard calibration ladder logic example – Hardy HI 1756-nDF User Manual
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Chapter 5
Hard Calibration
Hard Calibration is the traditional method of calibration using test weights. Hardy
recommends that the test weights total 80 to 100% of the load capacity.
Step 1. Empty your hopper, if possible.
Step 2. Have or set your Cal Low Reference weight to 0, or if you have product in the
hopper use that as your reference setting.
Step 3. Send the Cal Low command by setting the Output table word 0 to the command
number 100.0.
Step 4. Monitor the Input table word 0 & 1. Word 0 will echo your command number
when command is complete. Word 1 will be your status, 0 = no error.
Step 5. Add a known weight to the scale. This should be the same amount of weight as
your Span parameter is set to. Span value is the zero reference weight plus the known
amount of weight you will add.
Step 6. With weight on the scale, send the Cal high command by setting the Output
table word 0 to the command number 101.0.
Step 7. Monitor the Input table word 0 & 1. Word 0 will echo your command number
when command is complete. Word 1 will be your status, 0 = no error.
Calibration is complete if no errors.
NOTE: If you are doing the HARD calibration on channel 2 of a 2 channel module, use
Output table word 8 and Input table words 8 & 9.
Hard Calibration Ladder Logic Example
Verify that the parameters have been setup for your weighing process in accordance with
the setup information provided in Chapter 4.
For ladder logic examples please refer to the
website.
Located under the SUPPORT pull down and then select sample programs.