Lasse Hedeby

Sharing my passion for automation, programming, IT and other geeky stuff

A CAB printer can receive print jobs via Ethernet Raw using it’s own JScript syntax. Each command is separated by a line.

In order to do this from a SIMATIC S7-300 PLC, I’ve made an array of string (1-20) representing each line. Then the commands can be written directly in the code, and with CONCAT function dynamic data from tags can be added.

 //
 // Generate lines
 //
 statLines[1] := 'J';                                               // Line of JScript
 statLines[2] := 'S l1;0,0,50,53,85;ErrLbl';                        // Line of JScript
 statLines[3] := 'H 125,0,T,R0,B0';                                 // Line of JScript
 statLines[4] := 'O R,P';                                           // Line of JScript
 statLines[5] := 'T 0,7.77,0,3,4,u,k,q80;[J:c38.25]Production ID';  // Line of JScript
 statTempLine := 'B 8.16,12.58,0,datamatrix,1;';                    // 1. part of line of JScript
 statLines[6] := CONCAT(IN1:=statTempLine,IN2:=statProductCode);    // Combine 1. part with product code
 statLines[7] := 'T 36.16,8.02,0,3,4,u,k,q80;[J:c48.84]Error Code'; // Line of JScript
 statTempLine := 'T 37.6,14.64,0,3,6,k,q80;[J:c47.4]';              // 1. part of line of JScript
 statLines[8] := CONCAT(IN1:=statTempLine,IN2:=statErrorCode);      // Combine 1. part with error code
 statTempLine := 'T 0,46.47,0,3,4,k,q80;[J:c78.93]';                // Line of JScript
 statLines[9] := CONCAT(IN1:=statTempLine,IN2:=statProductCode);    // Combine 1. part with product code
 statLines[10] := 'G38.59,3.52,0;R:44.26,38.33,0.2,0.2';            // Line of JScript
 statLines[11] := 'A 1';                                            // Line of JScript 
 statLines[12] := '';
 statLines[13] := '';
 statLines[14] := '';
 statLines[15] := '';
 statLines[16] := '';
 statLines[17] := '';
 statLines[18] := '';
 statLines[19] := '';

Now each line can be combined into a array of characters and send as a TCP telegram using the T-Blocks (TCON, TSEND, TRCV etc.). What I do is to run a loop through each line and move each character to an array. At the end of each line I add a Carriage Return (0xD) to the array.

 // Convert all lines to array of charactors for telegram handling
 FOR statIndexLines := 1 TO 11 DO
   // Find length of string
   statStringLength := LEN(statLines[statIndexLines]);
 
   // Run through string and move every charactor to array
   IF (statStringLength <> 0) THEN
    FOR statIndexLength := 1 TO statStringLength DO
     // Get charactor from string and move to array of charactors
     statSendCharactors[statMemoryCharIndex] := STRING_TO_CHAR(MID(IN:=statLines[statIndexLines],L:=1,P:=statIndexLength));
 
     // Increment charactor index for every cycle
     statMemoryCharIndex := (statMemoryCharIndex + 1);
    END_FOR;
   END_IF;
 
   // Add Carriage Return after each line
   statSendCharactors[statMemoryCharIndex] := '$R';
   // Increment charactor index
   statMemoryCharIndex := (statMemoryCharIndex + 1); 
 END_FOR;

The block itself handles the TCP/IP communication and acts as client.

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August 3rd, 2016

Posted In: Automation, IT, S7-300/400, SIMATIC, Structured Text (SCL/ST)

Tags: , , , , ,