5.1 Analyzer Module Setup

5.1.6 Programmable Locic Control (PLC)

Example for PLC Programming:

♦You have three channels in your analyzer: CO, SO2 and O2.

♦You want to write a program for the zero and span gas calibration.

♦The valve gear is:

Sample CO/SO2/O2

CO/SO2O2

So you have the following zero and span gas for each gas component:

Channel:

CO

SO2

O2

Zero gas:

O2

O2

CO/SO2

Span gas:

CO/SO2

CO/SO2

O2

So you have the following logical combination of the valves:

 

O2 Valve

 

 

CO/SO2 Valve

Zero-Cal. Channel 1

 

 

 

 

Span Cal. Channel 1

 

 

 

 

Or

 

 

 

Or

 

Zero-Cal. Channel 2

 

 

PLC Output 1

Span Cal. Channel 2

 

 

 

 

 

 

Span-Cal. Channel 3

 

 

 

 

Zero Cal. Channel 3

 

 

 

 

 

 

 

 

 

 

PLC Output 2

With the conditions described you will get the following program:

Step-

Code

Function/Parameter

No.

 

 

1

-2

OR (Combination of the next three operands)

2

112

Zero gas calibration of channel 1

3

162

Zero gas calibration of channel 2

4

218

Span gas calibration of channel 3

5

-5

STORE (Saving the intermediate result to the result buffer)

6

40

Output result buffer 1

7

-6

CLEAR (Deleting the intermediate result of the calculator)

8

-2

OR (Combination of the next three operands)

9

118

Span gas calibration of channel 1

10

168

Span gas calibration of channel 2

11

212

Zero gas calibration of channel 3

12

-5

STORE (Saving the intermediate result to the result buffer)

13

41

Output result buffer 2

14

-6

CLEAR (Deleting the intermediate result of the calculator)

15

-7

END (End of program)

90003482(2) [NGA-e (MLT-Software 3.2.X)] 07/98

NGA 2000

5 - 41