Chapter 5 Temperature Measurement Module AH04PT/AH08PTG b. Interrupt service routine The procedure below explains how to trigger an interrupt service routine in a CPU module. Channel detection Alarm/Warning No (No detection) Enabling physical range detection Yes No Enabling interrupts Yes No interrupt Selecting interrupt numbers The interrupt service routines are I40~I251. 7. PID control a. KP/KI / KD Proportional action: The operation amount acts proportionally to the error. When a temperature is lower than a proportional band, the operation amount is 100%. When a temperature is within a proportional band, the operation amount decreases proportionally to the error.
When the setting value is the same as the present value, the operation amount is 0%. (Error=Setting value–Present value) Heater: The setting value is 1000 (100°C), and K P is 100 (10°C). The relation between the temperature and the operation amount is shown below. Operation amount 100% Heater 0% Temperature 90 ℃ Proportional band 100 ℃ 5-9