Mitsubishi FX3U-4AD User Manual page 448

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
PID Instruction (FNC 88)
Example 1: PID operation in heating (backward operation)
Example 2: PID operation in cooling (forward operation)
T
D3
L-16
Changes caused by disturbance
T
(PID operation)
D3
PI operation (without differential operation)
T
(PID operation)
D2
T
(PID operation)
D1
T > T
D3 D2
Changes in output caused by disturbance
T
(PID operation)
D3
T (PID operation)
D1
T
(PID operation)
D2
PI operation (without differential operation)
T > T > T
D3 D2 D1
PI operation (without differential operation)
Changes caused by disturbance
T (PID operation)
D1
T (PID operation)
D2
T (PID operation)
D3
T > T > T
D3 D2 D1
Changes in output caused by disturbance
T (PI operation)
D2
T (PID operation)
D1
PI operation (without differential operation)
(PID operation)
Target value (SV)
> T
D1
Time
T > T > T
D3 D2 D1
Time
Target value (SV)
Time
Time
3 Parameter
3.2 Details of Parameters