Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 186)

4-26
IM 04L31A01-01E
4. Press the DISP/ENTER key to confirm the changes.
The boxes for the items you changed turn from yellow to white, and the cursor
returns to the first item box.
Setup Items
Setting PID Parameters
• Loop number
The setup items of PID parameters are set 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 for the number of loops you specified at the time
of purchase.
Note
Some of the following parameter boxes do not appear, if [Control] > [#1 Control action, Input
setting] > [Control mode] is set to [Cascade].
• PID number
Specify the PID parameter group number [1] to [8]. The maximum selectable number
conforms to the [Control] > [#1 Control action, Input setting] > [PID number] setting.
• Target setpoint
Set the target setpoint (SP) in the range of “0 to 100% (EU (0 to 100%)) of the
measurement span” (initial value is 0%). However, this value is set within the high
and low limits of the target setpoint limiter.
• Proportional band (P)
Set the proportional band in the range of [0.1] to [999.9]% (initial value for [Temp] is
5.0%; initial value for [Press+Flow] is 12.0%).
• Integral time (I)
Set the integral time in the range of [0] to [6000] s (initial value for [Temp] is 240 s;
initial value for [Press+Flow] is 20 s).
• Derivative time (D)
Set the derivative time in the range of [0] to [6000] s (initial value for [Temp] is 60 s;
initial value for [Press+Flow] is 0 s).
• Output lower/upper limit
Set the low and high limits of the control output operation range in the range of [–
5.0]% to [105.0%] (where high limit > low limit). The initial low limit value is [0.0]%;
the initial high limit value is [100.0]%.
• Shutdown ← set only during 4-20 mA current output
When [Control] > [Output processing] > [Control output] is set to [Current-output] and
[Analog-output type] is set to [4-20mA] (see page 4-10), set whether the shutdown
function is used ([On] (initial value) or [Off].
• Manual reset
For the manual reset value, set the output value when the PV = the SP in the range of
[–5.0] to [105.0]% (initial value is 50%). This setting is valid only when the integral
action (integral time) is set to Off.
• Relay hysteresis ← can be set only during ON/OFF control
Set the hysteresis of the SP (or program setpoint) for ON/OFF control in the range of
“EUS (0.0 to 100.0%) of the measurement span” (initial value is 0.5%). Then, set the
activation position of the hysteresis to [Mid], [High], or [Low] (initial setting is Mid).
• Reverse/Direct
Set the direction (increase or decrease) of the output corresponding to the polarity of
the deviation to [Reverse] (initial setting) or [Direct].
• Preset output
Set the fixed-point output value when the operation is stopped in the range of “–5.0 to
105.0%” (initial setting is 0.0%).
4.9 PID parameters