CBLUSB01 datasheet(17/32 Pages) REDLION

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CALCULATION ROUNDING*

Rounding selections other than one, cause the Calculation Display to ‘round’ to

the nearest rounding increment selected (ie. rounding of ‘0.005’ causes 0.121 to

round to 0.120 and 0.124 to round to 125). Rounding starts at the least significant

digit of the Calculation Display. Remaining parameter entries (scaling point

values, setpoint values, etc.) are not automatically adjusted to this display rounding

selection. The displayed decimal point reflects that programmed in  .

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CALCULATION FILTER SETTING

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The calculation filter setting is a time constant expressed in tenths of a

second. The filter settles to 99% of the final display value within approximately

3 time constants. This is an Adaptive Digital Filter which is designed to steady

the Calculation Display reading. A value of ‘0’ disables filtering.

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CALCULATION FILTER BAND*

The digital filter will adapt to variations in the calculation filter. When the

variation exceeds the calculation filter band value, the digital filter disengages.

When the variation becomes less than the band value, the filter engages again.

This allows for a stable readout, but permits the display to settle rapidly after a

large process change. The value of the band is in display units, independent of

the Display Decimal Point position. A band setting of ‘0’ keeps the digital filter

permanently engaged.

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display units

* The decimal point position is dependent on the selection made in the

“Display Decimal Point” parameter.

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CALCULATION CONSTANT VALUE

The constant value is used in the Calculation Function formulas to provide

offsetting or scaling capabilities. For the , , and 

calculation functions, the Constant decimal point matches that Calculation

Decimal point position. For these functions, the “Constant Value” must be

lowered to a value of 0 for no offset.

For the 

, , and () calculation functions, there is no

“Constant Value” decimal point shown. However, when Input A “Display

Decimal Point”, Input B “Display Decimal Point” and “Calculation Decimal

Point” are in the same position, then the “Constant Value” decimal point will be

assumed to be at the same location as the “Calculation Decimal Point”. For the

Calculation Display to have the same resolution as Inputs A & B, the “Constant

Value” must be a value of 1 with trailing 0's for each assumed decimal point

location. Example: With Input A, Input B and the Calculation decimal points

entered as 0.00, then the “Constant Value” would be entered as 100 for no gain.

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