Chapter 7 Usage of Various Functions
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(3) Program Explanation
a) Use only PID operation (without A/T function)
(a) Convert the measured temperature (0 ~ 250°C) to current signal (4 ~ 20mA), and input the current signal to
the channel 1 of A/D module. Then, the A/D module converts the analog signal to digital value (0 ~ 4000)
(b) PID8 instruction will calculate manipulate value (MV : 0 ~ 4000) based on PID parameter settings (P_GAIN,
I_TIME, D_TIME, etc.) and PV from A/D module. Then, the calculated MV is output to the channel 0 of D/A
module.
(c) D/A module will convert the MV (0 ~ 4000) to analog signal (4 ~ 20mA) and output to the actuator (power
converter).
b) Use PID operation with A/T function
(a) Convert the measured temperature (0 ~ 250°C) to current signal (4 ~ 20mA), and input the current signal to
the channel 0 of A/D module. Then, the A/D module converts the analog signal to digital value (0 ~ 4000)
(b) A/T function block will calculate manipulate value (MV : 0 ~ 4000) based on the SV and PV from A/D module.
Simultaneously, the A/T module will calculate P,I and D parameters.
(c) The END output of A/T module will be 1 when the A/T operation is completed. Then, PID module will start
operation with PID parameters that are calculated by A/T module.
(d) D/A module will convert the MV (0 ~ 4000) to analog signal (4 ~ 20mA) and output to the actuator (power
converter).
G7F-ADHA module is supplied 2channels for A/D exchange and 1channel for D/A exchange module.
Remark
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