Mitsubishi Electric MELSEC-FX3S Series - Page 514

M-16
3 Parameter
FX 3S /FX 3G /FX 3GC /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
T D3 > T D2 > T D1
PI operation (without differential operation)
Time
Output (MV)
Changes in output caused by disturbance
PI operation (without differential operation)
T
D3 > T D2 > T D1
T D3 (PID operation)
T D3 (PID operation)
T D2 (PID operation)
T D1 (PID operation)
T D2 (PID operation)
T D1 (PID operation)
Target value (SV)
Time
Temperature
Changes caused by disturbance
T D3 > T D2 > T D1
Time
Output (MV)
Changes in output caused by disturbance
T D3 > T D2 > T D1
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)
T D3 (PID operation)