Chapter 6. PROGRAMMING
10 - 4
(2)
In the PID control module, 100
°
C (where the signal converter output is 12 mA, 12800 as a digital value.) is set as
SV. With regards to P.I.D constants, the manipulated value in the BCD digital switch is set as the proportional
constant when P0020 turns on, as the integral constant when POO21 turns on, and as the Derivative constant
when P0022 turns on.
(3)
MV, the result from PID processing is output at the channel 0 of the D/A conversion module.
(4)
If P0023 turns on, initial setting of the A/D conversion module, PID control module and D/A conversion module is
executed.
3)
Modules and their Signal Processing
Sensor measuring temperature range : 0 ~ 200
°
C
Signal converter current output range : DC 4 ~ 20 mA
A/D conversion module input current range : DC –20 ~ 20 mA
A/D conversion module digital output range : 9600 ~ 16000
PID control module PV(process value) input range : 9600 ~ 16000
PID control module processed MV range : 0 ~ 16000
D/A conversion module digital input range : 0 ~ 16000
D/A conversion module analog output range : DC 4 ~ 20 mA
Electric furnace temperature range by heater : 0 ~ 200
°
C
