Chapter 6. PROGRAMMING

6.2Application Programming

6.2.1A Program for Controlling an Electric Furnace

(with Applying the A/D Conversion Module, PID Control Module and D/A Conversion Module)

1)System Configuration

K7S-

 

K7S-

 

K7X-

 

K7X-

 

 

K7F-

 

 

 

K7F-

 

 

 

K7F-

 

 

K7S-

 

K7Y-

122S

 

30AS

 

310S

 

310S

 

 

AD4A

 

 

 

PIDA

 

 

 

DI4A

 

 

132S

 

201S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ch. 0

 

Loop 0

 

Ch. 0

 

 

 

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.

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LG Electronics K4F-PIDA, K7F-PIDA manual Application Programming, Initial Settings, Descriptions of the Program

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