AH500 Programming Manual ERR_DBW ： Range within which the error value is count as 0 (ERR_DBW) Double word MV_MAX ： Maximum output value (MV_MAX) Double word MV_MIN ： Minimum output value (MV_MIN) Double word MOUT ： Manual output value (MOUT) Double word I_MV ： Accumulated integral value (I_MV) Double word MV ： Output value (MV) Double word Explanation: 1. The instruction is used to implement the PID algorithm. After the sampling time is reached, the PID algorithm is implemented. PID stands for Proportional, Integral, Derivative. The PID control is widely applied to mechanical equipments, pneumatic equipments, and electronic equipments. 2. The setting of the parameters is as follows.
6-172 Data Setting Device number Function Description type range PID RUN _ BOOL Enabling the PID algorithm True: The PID algorithm is implemented. False: The output value (MV) is reset to 0, and the PID algorithm is not implemented. SV REAL SV Range of single- precision floating- point numbers Target value PV REAL PV Range of single- precision floating- point numbers Process value PID MODE _ Double word/DINT PID control mode 0: Automatic control When PID MAN is _ switched from ON to OFF, the output value (MV) then is involved in the automatic algorithm. 1: The parameters are tuned automatically for the temperature control.
When the tuning of the parameters is complete, the device is automatically set to 0, and is filled in with appropriate parameters K , K, and K . P I D