5-14
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Control method
A desired control method can be selected from two kinds of control methods.
Item (Bank) Display Contents Initial value User level
Control method
(Parameter bank)
0: ON/OFF control
1: Fixed PID
0 or 1 Basic,
Standard,
High function
• When the control output type is the position proportional output, only [1: Fixed
PID] can be selected.
• When the control output type is relay (R0), the initial value becomes "0". The
initial value is "1" in other cases.
• "Fixed" of [1: Fixed PID] means that the PID constant is not changed automatically
since the self-tuning (ST) provided for C35/36 is not run. However, the AT can be
run even in the fixed PID control.
• The following table shows valid and invalid functions related to [1: Fixed PID], as
well as other related parameters:
Classification of
Heat/Cool control
Classification of
RationaLOOP
Classification of
control action
RationaLOOP
function
AT Just-FiTTER
Normal control Normal PID P control X
*
X
PI control X
*
PD control X
*
X
PID control X
RationaLOOP P control X
*
X
PI control X
*
PD control X
*
X
PID control
Heat/Cool control Normal PID P control X
*
X
PI control X
*
PD control X
*
X
PID control X
RationaLOOP P control X
*
X
PI control X
*
PD control X
*
X
PID control
Related settings Control
algorithm
AT type Just-FiTTER
overshoot limit/
restraint/control
coefficient
MV low limit at AT Just-FiTTER
settling band
MV high limit at AT
AT Proportional
band adjust
AT Integral time
adjust
AT Derivative time
adjust
* Adjustment result becomes the PID control.
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