Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 383)

App-14
IM 04L31A01-01E
CLOG.MIN( )
Min. value
(Syntax)
CLOG.MIN(e1.e2.e5.e7)
(Conditions) Calculates the minimum value from channels e1, e2, e5, and e7 that
were measured at the same time.
CLOG.AVE( )
Average
(Syntax)
CLOG.AVE(e1-e6)
(Conditions) Calculates the average value from channels e1 through e6 that were
measured at the same time.
CLOG.P-P( )
Max. value-min. value
(Syntax)
CLOG.P-P(e1.e2.e5.e7)
(Conditions) Calculates the minimum-maximum value from channels e1, e2, e5, and
e7 that were measured at the same time.
Sample Equation
CLOG.MAX(01.02.CI04-CI06)+K01*SQR(02)
Example of Equation That Cannot Be Used
CLOG.AVE(01.03.05)+CLOG.AVE(02.04.06)
Reason: 2 CLOGs cannot be used in a single equation.
CLOG.AVE(01.ABS(01))
Reason: Computation elements used inside the parentheses.
If Computation Data is Abnormal
You can select the method for processing CLOG computed results if the computation
data is abnormal data (burnout error, AD error).
SKIP:
Skip any abnormal computation data and complete the computation. Failure
diagnostics are output.
ERROR: CLOG computed results in an error.
Conditional Expression (Control Computation)
[eq1?eq2: eq3]
(Syntax)
[CI01.GT.W01?CI02:CI03]
(Conditions) If control measurement data 1 is greater than constant W01, control
measurement data 2 become the computed results, and if control
measurement data 1 is not greater than W01, control measurement
data 3 becomes the computed result.
Example of Equation That Cannot Be Used
[CI01.GT.W01?CI02:CI03]: *W02
Reason: Combined with other operators.
Nesting Conditional Expressions
You can substitute conditional expressions for the eq1, eq2, and eq3 in the expression
[eq1?eq2:eq3]. For example, you can set a conditional expressions such as [eq1?[eq2-
1?eq2-2:eq2-3]:[eq3-1?eq3-2:eq3-3]].
You can nest indefinitely, as long as the total number of characters in the equation does
not exceed 120.
Appendix 3 Meaning and Syntax of Equations