Chapter 6. PROGRAMMING
10 - 3
6.2 Application Programming
6.2.1 A Program for Controlling an Electric Furnace
(with Applying the A/D Conversion Module, PID Control Module and D/A Conversion Module)
1) System Configuration
1)
Initial Settings
(1)
PID control module
A)
Specifying used loop : loop 0
B)
Specifying forward/reverse action : forward action
C)
Setting SV: 12800
D)
Specifying auto/manual processing : auto processing
(2)
A/D conversion module
A)
Specifying used channel: channel 0
B)
Specifying output data type: -192 to 16191
C)
Setting filter constant: 50
(3)
D/A conversion module
A)
Specifying used channel: channel 0
B)
Specifying input data type: -192 to 16191
C)
Output when no channel is used or the CPU module is in the stop state : The median value of the output range is
output.
2)
Descriptions of the Program
(1)
A temperature 0 to 200
°
C from the temperature sensor is converted into an analog signal 4 to 20 mA and then
the signal is input to the channel 0 of the A/D conversion module channel and converted into a digital value 9600
to 16000.
K7S-
122S
K7F-
AD4A
K7S-
30AS
K7X-
310S
K7X-
310S
K7S-
132S
K7Y-
201S
K7F-
PIDA
K7F-
DI4A
Ch. 0
Loop 0
Ch. 0
