Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 34)

1-22
IM 04L31A01-01E
1.4 PV Input Related Settings
Input Range
Input Type
Select the input source for making input range related settings from the following. Select
“RemoteSP” when setting the remote input when you are performing remote/local
switching of the SP. When using program control, “RemoteSP” cannot be selected
because remote input is not possible.
• During single-loop control or cascade control: PV1/RemoteSP
• During loop control with PV switching: PV1/PV2/RemoteSP/PVrange
Set “process value 1” (PV1) and “process value 2” (PV2). “PVrange” is used for “loop
control with PV switching” when the input range of two PV inputs (PV1 and PV2) is
different and PV range conversion (see page 1-24) is to be performed. When set to “PV
range,” “PV upper-/lower-limits,” “unit,” and “PV switching lower/upper limits” (“PV lower-
limit” if the input switching method is “PV High”) are set in place of the following settings.
Measurement Mode
Select from the following according to the type of input.
TC (thermocouple), RTD (resistance temperature detector), scale (linear scale), and 1-5 V.
Select scale when scaling the input signal to values with an appropriate unit for the
application. If you select scale, set the lower and upper limits.
Type (setting only when measurement mode is set to “scale”)
Select the type of input signal from “Volt,” “TC” (thermocouple), and “RTD” (resistance
temperature detector.”
Range
Set the range (thermocouple or resistance temperature detector type) that matches the
input signal type. This setting determines the measurement range (measurable range).
• Thermocouple
R, S, B, K, E, J, T, N, W, L, U, PLATINEL, PR40-20, and W3Re/W25Re.
• Resistance temperature detector
Jpt100 and Pt100.
• Voltage
Standard signal: 1-5 V (when “measurement mode” is set to “1-5 V”)
Current voltage: 20 mV, 60 mV, 200 mV, 2 V, 6 V, 20 V, and 50 V.
Span
Set the “measurement span,” the actual range of control (upper limit and low limit), within
the minimum and maximum values of the measurement range.
Unit
You can enter the unit using up to 6 alphanumeric characters.
PV Correction
Input Filter
The input filter can be used to eliminate noise when harmonic noise is included in the PV input
such as in current signals and pressure signals. The input filter is first-order-lag computation. The
larger the time constant (parameter setting), the stronger the noise elimination function becomes.
The input filter is also used for the improvement of the controllability and for phase correction.
The time constant of the input filter can be changed during operation as an operation parameter.
Selectable range: OFF (no filter) or 1 to 120 s (initial value is OFF)
Raw input
Filter time constant:
small
Filter time constant:
large