YOKOGAWA Yew 80 Series, User Manual, Page: 21 / 66

4-3
IM 01B04K01-02E
Principles of Operation
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2
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App
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3
5
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4
● Explanation of Input processing block
• A/D conversion:
Performs A/D conversion on input signals.
• Normalization:
A/D-converted signals are converted to a scale of 1 to 5 V DC. (INPUT1)
• Square root calculation (LINEARIZE1):
When square root calculation is set to ON, the input processing block performs square
root calculation on the input signal.
The low-cut point (LOW CUT1) can be set to the square root calculation. The figure
below shows operation when the input signal is near the low-cut point. This low-cut
point is provided with a hysteresis of 0.2%.
F0403.ai
X =
Input after low-cut processing
Input (X)
Hysteresis fixed at 8 mV (0.2%)
Low-cut point
Y Y,X: 1 to 5 (V)
When X
≤
1V: Y=X
X - 1 + 1 Y = 2 x
• Scaling (SKYD-x04 only):
The display in engineering unit is available according to the SCH1, SCL1 and DP1
parameter settings.
The value after scaling (or, when the bias function is used, the value obtained by
adding bias to this value) becomes PV1.
SCH1, SCL1, DP1 setting (default: 0.0 to 100.0)
<Setting Method>
(1) Set the decimal point position matched to the unit system actually in use at DP1.
(Example: two digits past the decimal point)
(2) Register the measuring input scale range at SCH1 and SCL1.
(Example: SCH1=20.00, SCL1=0.00)
F0404.ai
(Example)
1V 5V
0.0 (SCL1) 100.0 (SCH1)
Default scale
0.00 (SCL1) 20.00 (SCH1)
Measuring input scale
(after scaling)
Decimal point position registered at DP1.
4.2 Description of Functions