| Task: | Program |
|---|---|
| Structure: | Combination |
| Mathematical Model: | Linear |
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Model: FX3U-4AD-ADP
Mitsubishi PLC FX3U-4AD-ADP realizes temperature PID closed-loop control habit
When wiring, use shielded compensation wire and analog input cable, shielding all possible interference. The fx3U-4AD-ADP special function module number is 0. In the temperature control system, the electric heater is heated, and the temperature is detected by thermoelectric coupling. The analog input module FX3U-4AD-ADP matching the thermoelectric temperature sensor converts the temperature into digital output, and the CPU compares the detected temperature with the temperature set value. The PID control of PLCFX3U-4AD-ADP is used to change the heating time of the heater so as to realize the closed-loop control of temperature.
When selecting switch X10, the set value of control parameters must be written by instruction in advance before PID operation. M8002 is the initialization pulse. MOV instruction was used to transmit the target value, input filter constant, differential gain, upper limit of output value, and set value of lower limit of output value to data registers D500, D512, D515, D532, and D533 respectively.
Make M0 electricity, the use of automatic tuning function is in order to get PID control, automatic tuning can not automatically set the parameters must be set through the instruction, fx3U-4AD-ADP for confirmation, mode setting, and in the PLC operation read data from FX3U-4AD-ADP to THE PLC D501, Step 103 Initializes the PID action.
The heating time of heater is constantly adjusted by PID control, so as to realize constant temperature control. When the set value of the control parameters or the data in the PID operation is wrong, the operation error indicates that the relay M8067 becomes ON state, which is output to the fault indicator through Y0.
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