Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 163)

4-3
IM 04L31A01-01E
Control Function Related Setup Operations
4
• Method (set only when the control mode is set to [PVSwitching])
Select the switching condition of the two PV inputs from [Range], [PVHigh], and
[Signal].
• Program control (set only on models with the program control option)
Turns [On]/[Off] program control (initial value is Off). This setting applies to both loops
within the single control output terminal block. This setting is invalid for loops which
the control mode is set to [Off] or [Retrans].
• PID control mode
Select either [Follow-up] or [Fixed-point]. This setting is invalid for loops whose
control mode is set to [Off] or [Retrans].
Setting Input-Related Parameters
The setting menu differs when the PV/SP computation function is ON or OFF.
• Loop number (first and last channel when the PV/SP computation function is ON)
Set the [Burnout] and [RJC] parameters for each loop. When changing these
parameters, this setting is used to select the target loop number [1] to [6] (initial value
is 1). The loop number is displayed up to the number of loops you specified at the
time of purchase.
When the PV/SP computation function is ON, you can set the control input channel
number.
• Burnout
Sets the burnout action for the PV inputs of each loop. [Measure2] is valid only when
the control mode is set to [PVSwitching]; [Remote] is valid only when the PV input is
set to remote input. This setting is invalid for PV inputs other than thermocouples and
standard signals.
• Measure1/Measure2/Remote
Select [Off], [Up], or [Down] (initial value is Up) according to the description given
below.
Off:
Burnout action Off
Up: When a burnout occurs, the measured result is set to positive overrange
“+*****.”
Down: When a burnout occurs, the measured result is set to negative overrange
“–*****.”
When the PV/SP computation function is ON, you can turn the buffer for the control
input channel ON or OFF. When ON, the measured results are fixed according to
the settings in PV/SP computation error. For information about PV/SP computation
error see section 4.16, “PV/SP Computation and Analog Retransmission Settings
(Style Number S3).”
• RJC
This is the reference junction compensation setting for thermocouple inputs. The
setting is entered on the PV inputs of each loop. [Measure2] is valid only when the
control mode is set to [PVSwitching]; [Remote] is valid only when the PV input is set to
remote input. This setting is invalid for PV inputs other than thermocouples.
• Measure1/Measure2/Remote
Select either [Internal] or [External] (initial value is Internal).
Internal: Uses the reference junction compensation function of the CX2000.
External: Uses an external reference junction compensation function.
If set to [External], a box for entering the reference junction compensation voltage
that is added to the input appears. Set the value in the range of [–20000] µV to
[20000] µV (initial value is 0 µV).
When the PV/SP computation function is ON, you can select Internal or External
(default value is Internal) for the control input channel. If set to External, a setting box
for the reference junction compensation voltage that is added to the input is displayed.
The setting range is –20000 µV to 20000 µV (default value is 0 µV).
4.1 Control > Control action, Input setting