Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 206)

4-46
IM 04L31A01-01E
Setup Item
Constant Settings
• Constants
You can specify the constants used in equations. Constants have 5 significant digits
excluding the decimal point. When setting an exponent, use a mantissa of 5 digits or
less, and an exponent of 2 digits or less.
The setting range is as follows:
–9.9999E + 29 to –1.0000E–30, 0, 1.0000E–30 to 9.9999E+29
Numerical Display Method
The display method is determined by the numeral. For –100000 < W –0.0001, 0, 0.0001
W < 100000, a normal numeral is displayed. Otherwise, an exponent is displayed.
However, even for –100000 < W –0.0001 or 0.0001 W < 100000, if the number has 8
characters or more including the decimal point, an exponent is used.
Significant Digits
With constants for control computations, the significant digits of the input numeral is
retained. For example, if 0.010 or 1.00E20 is input, 0.010 or 1.00E20 results. However,
in the following cases, the final 0 after the decimal point is insignificant.
• When a normal input value was automatically converted to an exponent
• When a value input in exponential display was automatically converted to a normal
value
• When 0.00000 was entered (reverts to 0. The four places after the decimal remain
as-is).
4.18 Control Constant Settings (Style Number S3 or Later)