Data that can be used in equations – Yokogawa Data Acquisition with PID Control CX2000 User Manual
Page 376
App-7
IM 04L31A01-01E
Appendix
App
Computation Types That Can Be Used by the Computation Function
Computation
Measurement
PV/SP
Analog
Logic
type
computation
computation
retransmission computation
Four rithmetical operations
Yes
Yes
Yes
No
Power
Yes
Yes
Yes
No
Exponent
Yes
Yes
Yes
No
Square root
Yes
Yes
Yes
No
Absolute value
Yes
Yes
Yes
No
Common logarithm
Yes
Yes
Yes
No
Relational operation
Yes
Yes
Yes
No
Logical operation
Yes
Yes
Yes
No
Statistical computation (TLOG)
Yes
No
No
No
Statistical computation (CLOG)
No
Yes
Yes
No
Conditional expressions
Yes
Yes
Yes
Yes
Data That Can Be Used in Equations
For TLOG computation, only measured and computed data can be used. For CLOG
computation, only control measured data and measured data can be used. For all other
computations, all types of data can be used.
Measured Data (01 to 20)
Specify the measured data using channel numbers. If scaling is used, the scaled values
are used in the computation.
Computed Data (31 to 60)
Specify the computed data using channel numbers.
Control Measurement Data (CI01 to CI10)
Specify the control measurement data using control input channel numbers. If scaling is
used, the scaled values are used in the computation. You can use this data only in
control computation when the PV/SP computation function is ON.
Internal/External Control Data (101 to 118, 201 to 248)
Specify internal control channels and external control channels using channel numbers.
Constants (measurement computation: K01 to K30, control compuration: W01 to W36)
The values assigned to K01 to K30 or W01 to W36 can be used as constants. Enter the values as
K01 to K30 or W01 to W36 in the equations. Range of Constants (maximum significant digits is 5):
–9.9999E+29 to –1.0000E–30, 0, 1.0000E–30 to 9.9999E+29
Communication Input Data (C01 to C30)
You can use values that are set through communications. Enter the data as C01 to C30
in the equations. For a description on how to set the data, see the DAQSTATION
CX1000/CX2000 Communication Interface User’s Manual (IM 04L31A01-17E)
.
Range of values through communication input (maximum significant digits is 5):
–9.9999E+29 to –1.0000E–30, 0, 1.0000E–30 to 9.9999E+29
Status of the Remote Input of the Measurement Alarm Option Terminal Block and the
Contact Input of the Control Output Terminal Block/Control DIO Expansion Terminal Block
(DI001 to DI006, DI101 to DI106, DI201 to DI206, RI001 to RI012, D01 to D08)
The status of the contact input or remote input signal can be assigned to “1” and “0,” and
used in the equations. Enter the data as D01 to D08 (the number following the letter D is
the remote input number) in the equations. The correlation between the status of the
remote input signal and the value “1” and “0” are shown below.
Types of Input Signal
Status
Correlation with “1” and “0”
Contact
Closed
1
Open
0
Open collector
Terminal voltage level is Lo
1
Terminal voltage level is Hi
0
Appendix 2 Supplementary Explanation of the Computation Function