FEC920: USER GUIDE
Page 109
September 18
Sel1
Output = Input 1 if Input Selector = Input1
Output = Input 2 if Input Selector = Input2
Input 1(2) Multiplier The scaling factor for input 1(2). This multiplying factor is applied to the input of the
function, but does not affect the displayed values of Input1 and Input 2 (below).
Units
Allows a five-character string to be entered for the function
Resolution
Sets the number of decimal places for the Output value. Input resolution (if applicable) is
that of the relevant input.
High Limit
The high limit for input, output and fallback values. Minimum value is Low Limit.
Low Limit
The low limit for input and fallback values. Maximum value is High Limit.
Fallback Strategy
Clip Bad: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the output value
is set to the appropriate limit, and the status is set to ‘Bad’. If the input signal is within the
limits, but its status is bad, the output is set to the Fall Back value.
Clip Good: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the output
value is set to the appropriate limit, and the status is set to ‘Good’. If the input signal is
within the limits, but its status is bad, the output is set to the Fall Back value.
Fall Bad: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the output value
is set to the Fall Back value, and the status is set to ‘Bad’
Fall Good: If the input value is above ‘High Limit’ or below ‘Low Limit’, then the output
value is set to the Fall Back value, and the status is set to ‘Good’
Upscale: If the input status is bad, or if the input signal is above ‘High Limit’ or below ‘Low
Limit’, the output value is set to the High limit.
Downscale: If the input status is bad, or if the input signal is above ‘High Limit’ or below
‘Low Limit’, the output value is set to the Low limit.
Fallback Value
The value to be adopted by the output, under error conditions, if ‘Fallback Status’ is set to
‘Fall Good’ or ‘Fall Bad’.
Input Selector
For ‘Select’ operation only. When wired to a suitable parameter, Input Select becomes
read only. Input 1 is selected if ‘Input Select’ = 1; Input 2 is selected if ‘Input Select’ = 2.
Input Select values greater than 2 are ignored. If not wired, the user may select the
required input using the scroll keys.
Input 1(2)
Wired to suitable input parameters. Displayed values ignore any input multiplier effects.
Output
Gives the output value for the operation.
Status
Shows the status of the output value, as ‘Ok’ or ‘Error’.
Note:
* For this implementation:
0 to the power 0 = 1.
Negative values raised to any power result in bad status.
0 raised to a negative power results in bad status.
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