139
Adjustment Level Section 7-4
Settings
See Also
Related Parameter
“Input type” (initial setting level) (page 143)
7-4-8 Proportional Band (p)
Integral Time (i)
Derivative Time (d)
Condition: The control must be 2-PID control.
These parameters set the PID constants for control. The PID can be automat-
ically set by executing autotuning.
Function Proportional action:P refers to control in which the MV is proportional to the
deviation.
Integral action: I gives a control action that is proportional to the time inte-
gral of the control error. With proportional control, there is
normally an offset (control error). So, proportional action
is used in combination with integral action. As time
passes, this control error disappears, and the SP comes
to agree with the control temperature (PV).
Derivative action: D gives a control action that is proportional to the time
derivative of the control error. As proportional control and
integral control correct for errors in the control result, the
control system will be late in responding to sudden
changes in temperature. Derivative action enables control
that is proportional to a predicted process output to cor-
rect for future error.
Communications
Settings
See Also
• Related Parameters
“AT execute/cancel” (adjustment level) (page 135)
“
PID/OnOff” (initial setting level) (page 145)
Setting range Unit Default
FFFFF831H to 0000270FH (−199.9 to 999.9) °C or °F0.0
Setting ch Variable type Address
Proportional band 1 C1 0012
2 C1 0112
Integral time 1 C1 0013
2 C1 0113
Derivative time 1 C1 0014
2 C1 0114
Setting Setting range Unit Default
Proportional band 00000001H to 0000270FH (0.1 to 999.9) EU 8.0
Integral time 00000000H to 00000F9FH (0 to 3999) Second 233
Derivative time 00000000H to 00000F9FH (0 to 3999) Second 40
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