PLC Tutorials

Statement List (STL) to Find Highest Value

This article explains the detail logic and all steps involved to find the Highest value in given Data block using the Statement List (STL). Also helps to you in array pointer logic in simatic manager.

Statement List (STL) to Find Highest Value

Follow the below setps.

Step 1:

Create Global Data Block write no of data in DB and save it.

Data you can save in dec, bin, int, real format.

We have written data here in dec for our program.

Insert Data Block as shown below.

Step 2:

Create Data Value in the Data Block.

Step 3:

Insert Function

Step 4:

Create Function and write code in STL as given below.

      A     M     40.2                  /// START Search  CMD

      JCN   END

      L     0

      T     MW    50                    // STARTINNG LOCATION OF DATA

      T     MW    56

REOP: NOP   0

      L     MW    50

      SLW   3

      LAR1  

      OPN   "DATA"

      L     DBB [AR1,P#0.0]             // DATA 1ST LOCATIO

      L     MB    56

      >I    

      JC    STR                         //// DATA GREATER THEN CHENG

INC:  L     MW    50

      L     1                           // INCREASE LOACTION 

      +I    

      T     MW    50

      L     MW    50

      L     21                          // IF DATA LOCATION IS EXCCED

      <I                                // CHECK FOR NEXT LOCATION

      JC    REOP

      JU    END

STR:  NOP   0

      L     MW    50

      SLW   3

      LAR1  

      OPN   "DATA"

      L     DBB [AR1,P#0.0]

      T     MB    56

      JU    INC

END:  NOP   0