IDEC MICROSmart FC5A Series, Руководство пользователя

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14: PID I
NSTRUCTION
14 ‐ 18 FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y ‐ B1273
Application Examples
The following two application examples demonstrate an advanced auto tuning and PID action to keep a heater tempera ‐
ture at 200°C.
In both examples, when the program is started, the PID instruction first executes advanced auto tuning to determine the
AT parameters, such as AT sampling period, AT control period, AT set point, and AT output manipulated variable, using the
temperature data inputted to the analog input module, then executes auto tuning to determine PID parameters such as
proportional term, integral time, derivative time, sampling period, control period, and control action. When auto tuning
is complete, PID action starts to control the temperature to 200°C using the derived PID parameters.
Example 1: ON/OFF Control Using Relay Output
The heater is turned on and off according to the output manipulated variable calculated by the PID action. When the
heater temperature is higher than or equal to 250°C, an alarm light is turned on by the high alarm output.
The analog input operating status is also monitored to force off the heater power switch and force on the high alarm
light.
System Setup
Temperature Control by Auto Tuning and PID Action
Type K
High Alarm Light
Output Q1
Heater
+24V 0V 10 11 12 13 14 15
DC OUT COM
DC IN 0 1 2 3 4 5 6 7
L N
100-240VAC Ry.OUT
COM0 Ry.OUT
COM1 Ry.OUT
COM3 11 Ry.OUT
COM2 10
0 1 2 3 4 5 6 7
Fuse
+
–
+
–
L
Output Q0
IN0
FC5A ‐ C24R2 FC4A ‐ L03AP1
Thermocouple
Process Variable after Conversion (S1+0)
Time
High Alarm Value (S1+14): 2500 (250°C)
Set Point (S3): 2000 (200°C)
AT Set Point (automatically determined)
Auto Tuning
PID Action