Delta AH500 - Page 168

AH500 Module Manual
5-46
b. Interrupt service routine
The procedure below explains how to trigger an interrupt service routine in a CPU module.
 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.
100℃
100%
0%
Proportional
band
Temperature
Operation amount
Heater
90℃
Channel
detection
Alarm/Warning
Enabling
physical range
detection
Yes
Enabling
interrupts
Yes
Selecting interrupt
numbers
No
No (No detection)
No interrupt