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M-16
3 Parameter
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
PID Instruction (FNC 88)
3.2 Details of Parameters
Example 1: PID operation in heating (backward operation)
Example 2: PID operation in cooling (forward operation)
Time
Temperature
Changes caused by disturbance
TD3 > TD2 > TD1
PI operation (without differential operation)
Time
Output (MV)
Changes in output caused by disturbance
PI operation (without differential operation)
T
D3 > TD2 > TD1
TD3 (PID operation)
TD3 (PID operation)
TD2 (PID operation)
TD1 (PID operation)
TD2 (PID operation)
TD1 (PID operation)
Target value (SV)
Time
Temperature
Changes caused by disturbance
TD3 > TD2 > TD1
Time
Output (MV)
Changes in output caused by disturbance
TD3 > TD2 > TD1
PI operation (without differential operation)
T
D1 (PID operation)
T
D2 (PID operation)
Target value
(SV)
PI operation (without differential operation)
T
D3 (PID operation)
T
D1 (PID operation)
T
D2 (PI operation)
TD3 (PID operation)