Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 200)

4-40
IM 04L31A01-01E
Setup Item
PV/SP Computation Settings
• Loop number
Select the loop number to perform PV/SP computation.
• PV/SP
Select the item for which to set the equation. The available settings vary depending
on the control mode.
Single loop control:
PV
2 input switching control: PV1, PV2
Cascade control: PV
SP can be selected when program control is OFF and remote input is ON (see section
4.2, “Control > Contact-input registration/AUX (Alarm mode)
).”
• Mode
Select whether to activate or deactivate PV/SP computation.
If set to OFF, the measured input values of the input terminals on the analog input
terminal block for control assigned as default values, are PV.
• 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.
When the mode is OFF, the input terminal numbers of the analog input terminal block
for control assigned as default values are input.
PV SP PV(1) SP PV1 PV2 SP PV1 PV2 SP
Control
Mode
Single Loop
Control
Cascade
Control
2 Input Switching
Control (4 loops)
2 Input Switching
Control (6 loops)
Loop 1
Loop 2
Loop 3
Loop 4
Loop 5
Loop 6 CI01
CI04
CI06
CI09
CI03
CI08 CI02
CI05
CI07
CI10
CI01
CI01 CI01
CI04
CI06
CI09 CI02
CI07
CI01
CI04
CI06
CI09 CI02
CI05
CI07
CI10 CI03
CI01
CI08
CI01 CI01
CI04
CI06
CI09 CI02
CI05
CI07
CI10 CI01
CI01
CI01
CI01
• PV Range Lower Limit/Upper Limit
Set in the range –30000 to 30000 (max value > min value, max-min, ≤ 30000).
Settings cannot be changed during control operation, while writing to memory, or
during measurement computation.
Note
If you change the PV range upper limit/lower limit value, the range-related setting items below
(items set using industrial units EU or EUS) are initialized.
Bias value, alarm value, target setpoint ramp-down, target setpoint ramp-up, reference point,
switching hysteresis, reference deviation, PID parameters, target setpoint, relay hysteresis, ten
segment linearizer mode, SP low limit, SP high limit, boundary of partial expanded display.
• Input Switching PV Lower Limit Value/Upper Limit Value (2 input switching
control only)
Set in the range –30000 to 30000 (max value > min value, max. - min., 30000), and
within the PV range. When Setting Range is selected under Control Basic Setting >
#1 Control operation, settings > Switching condition, and when [Input switching PV
upper limit/PV lower limit] and [Switching condition] are [PV upper limit], only [Input
switching] is set. [2]
Settings cannot be changed during control operation, while writing to memory, or
during measurement computation.
4.16 PV/SP Computation and Analog Retransmission Settings (Style Number S3 or Later)