Mitsubishi Electric MELSEC iQ-F FX5 - Setting and program examples

660
35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.6 Function (PID Control Via Parameter)
Setting and program examples
This section shows parameter setting examples and program examples when using the heating-cooling PID control function.
Setting example 2
When "Control mode" is "Standard PID control mode", after auto tuning starts and ends completely, PID control using the
obtained control parameters is performed.
■System configuration
■Operation example
0V
COM0
Y0
FX5-4AD-TC-ADP
Y1
24V X0 X1
FX5U-32MT/ES
L1+
L1-
X0: PID control execution command
X1: Auto tuning used/not used
Y0: Error indication
Y1: Control output
Parameter settings
24VDC
Temperature tank
Electric
heater
Temperature sensor
(thermocouple)
Heater
Measured value (PV)
During auto tuning During PID control
Target value (SV) = 50.0ºC
1st cycle 2nd cycle
Time
ON
OFF
ON
OFF
During auto tuning (when the upper limit output limiter is 90%)
Output value (MV) = 90% Output value (MV) = 90% Output value (MV) = 0%
Control output
(Y1)
Output value (MV) / 100 ×
Control output cycle = 4.5s
Output value (MV) / 100 ×
Control output cycle = 4.5s
Control output cycle
(50 × 100ms = 5s)
Control output cycle
(50 × 100ms = 5s)
Control output cycle
(50 × 100ms = 5s)
During PID control
Output value (MV) = 60% Output value (MV) = 30% Output value (MV) = 40%
Control output
(Y1)
Output value (MV) / 100 ×
Control output cycle = 3.0s
Output value (MV) / 100 ×
Control output cycle = 1.5s
Output value (MV) / 100 ×
Control output cycle = 2.0s
Control output cycle
(50 × 100ms = 5s)
Control output cycle
(50 × 100ms = 5s)
Control output cycle
(50 × 100ms = 5s)