Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 201)

4-41
IM 04L31A01-01E
Control Function Related Setup Operations
4
• Units
Computed result units are set using 6 characters or less. Settings cannot be changed
during control operation.
• Ratio Settings (only when SP is selected for PV/SP)
When applying a specific ratio to SP, turn the setting ON, and set the ratio in the
range from 0.0001 to 30000. Settings can be changed during control operation, while
writing to memory, or even during measurement computation.
• Remote Bias (Only When SP Is Selected for PV/SP)
Turn the setting ON to add a constant value (bias value) to SP, and set the bias value
within EUS (–100% to 100%). Settings can be changed during control operation,
while writing to memory, or even during measurement computation.
• Computation Error
Set whether to apply the computed value to the upper limit value (over) or the lower
limit value (under) if the computed results in an error.
Over:
Use the upper limit value of the PV range for the PV and SP value. [+*****] is
displayed. Control operation stops, and preset output occurs.
Under: Use the lower limit value of the PV range for the PV and SP value. [–*****] is
displayed. Control operation stops, and preset output occurs.
Note
• Just after the power is turned ON, PV/SP computation may begin before measurement/
control channels are finalized. In such cases, the PV/SP computed results are indefinite,
and control PID computation is not performed. If the power outage recovery is set to
“continuous” and an outage occurs, or an instantaneous outage occurs (5 seconds or
less), the previous value is output. If the power outage recovery is set to “manual” or
“automatic” and a power outage occurs, the preset value is output.
• If errors occur on the control input channels used in the equation (burnout, AD converter
abnormality, reference junction compensation error), failure diagnostics are performed but
not output in computation errors.
Analog Retransmission Settings
• Loop Number
Select the loop number to perform analog retransmission. This is valid for the loops
set for analog retransmission in the control mode of Control Basic Settings.
• Mode
Select whether to activate or deactivate analog retransmission computation. When
OFF, 0 V or 0 mA are output.
Note
When the mode is OFF, manual operations in operation mode are not available.
• Equation
Follow the instructions in the equation pop-up window to enter the equation (using
120 characters or less). The number of data that can be used in equations is 35. You
can also use the control constants W01-W36 in the equation. Measurement
constants K01-K36 cannot be used.
See appendix 3, “Meanings and Syntax of Equations” for information on how to create
equations.
• Upper/Lower Limit of Output Span
Set in the range –30000 to 30000 (upper limit value > lower limit value, upper - lower
30000). The upper limit value specified here is 100%, the lower limit value is 0%, and
the computed results are converted. Converted results are output according to the
control output type (see section 4.3, “Control > Output Processing”).
• Units
Computed result units are set using 6 characters or less.
4.16 PV/SP Computation and Analog Retransmission Settings (Style Number S3 or Later)