Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 302)

10-3
IM 04L31A01-01E
Computation and Report Function Related Operations (Only on Models with the Computation Function Option)
10
• Calculation expression
Set the equation (up to 40 characters) according to the description given on the
equation pop-up window. For a description on how to create equations, see appendix
3, “Meaning and Syntax of Computing Equations.”
• Span Lower/Upper
Set the upper and lower limits of the computation span (range of computed values).
Selectable range of values and the decimal place are as follows.
Selectable range of values: –9999999 to 99999999
Selectable decimal places: X.XXXX, XX.XXX, XXX.XX, XXXX.X
• Unit
Enter the unit of the computed result using up to 6 alphanumeric characters.
• Constant
Set the constants (K01 to K30) that are used in the equations. The number of
significant digits is 5 excluding the decimal point. When specifying the constant using
exponential notation, the mantissa is less than or equal to 5 digits, and the exponent
less than or equal to 2 digits.
The selectable range is as follows.
–9.9999E+29 to –1.0000E–30, 0, 1.0000E–30 to 9.9999E+29
Note
If the Math On/Off, calculation expression, or span setting is changed, the alarms for that
channel are turned [Off].
Setting Tags of Computation Channels
• First-CH/Last-CH
You can assign channel numbers [31] to [60] as computation channels. The range of
numbers here is used to set the range of channels for setting the tag. The target
channels also apply to [Alarm delay], [TLOG], and [Rolling average] settings.
• Tag
Enter the tag name using up to 16 alphanumeric characters.
Note
For the procedure in displaying tags in place of channel numbers, see section 8.4,
“Measurement Function > Settings Related to Tag Display for Channels.”
10.1 Assigning Computation Channels and Setting Computing Equations, Constants and Tags