scripting_for_plc_servers

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scripting_for_plc_servers [2021/01/29 10:19]
wikiadmin 		scripting_for_plc_servers [2021/09/10 16:09] (current)
wikiadmin
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-==== TransSECS Devices - Scripting for PLC Servers ====+===== TransSECS Devices - Scripting for PLC Servers =====
  
 To write a value to a server in the devices the format is: To write a value to a server in the devices the format is:
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 </code> </code>
  
-**Set a value to a field in a message and send the message**+==== Set a value to a field in a message and send the message ====
  
  
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 </code> </code>
  
-Here's a more concreted example. In an S2F42/S2F50 reject response set the CPName to indicate which parameter is in error:+Here's a more concrete example. In an S2F42/S2F50 reject response set the CPName to indicate which parameter is in error:
  
 <code javascript> <code javascript>
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 </code> </code>
  
-**Register for Connection Status Notification in TransSECS Host Application**+==== Register for Connection Status Notification in TransSECS Host Application ====
  
 In a GEMHost application the TransSECS controller publishes the status of the connection. In a GEMHost application the TransSECS controller publishes the status of the connection.
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 The details of the connection status are [[programmatic_host_connection_status|described here]] The details of the connection status are [[programmatic_host_connection_status|described here]]
  
-**Sending a List to PLC Registers**+==== Writing a List to PLC Registers ====
  
 If a message is received from the host contains a list of variable length it's easy to split this list and place it in registers on the PLC. If a message is received from the host contains a list of variable length it's easy to split this list and place it in registers on the PLC.
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 </code> </code>
  
-**Reading a Variable Length List from a PLC and updating a VID**+==== Reading a Variable Length List from a PLC and updating a VID ====
  
 The most challenging part of reading the list from the PLC is managing the length of the list. The most challenging part of reading the list from the PLC is managing the length of the list.
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 Discrete - SecsFormat11 Discrete - SecsFormat11
  
-Note that the signed conversions are likely to be incorrect.  For improved control over the conversion, the SecsFormat 00 can be created in a script.+For an S7 Array the conversions X,B,W,I,D all convert to SecsFormat5. R (real) convert to SecsFormat44 and S (String) to SecsFormat20. 
 + 
 +For improved control over the conversion, the SecsFormat00 can be created in a script.
  
 In this example we create a SecsFormat00 containing signed integers  - SecsFormat34 In this example we create a SecsFormat00 containing signed integers  - SecsFormat34
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 } }
 new SecsFormatValueObject(listValue); new SecsFormatValueObject(listValue);
 +</code>
 +
 +==== Reading a File and Storing as Binary Data in the PLC ====
 +
 +This example uses the Melsec Binary (MelsecBinary) server.  It reads a file from the disk, compresses the file and sends it to the server.
 +
 +
 +<code>
 +var Deflater = Java.type("java.util.zip.Deflater");
 +var Inflater = Java.type("java.util.zip.Inflater");
 +var Files = Java.type("java.nio.file.Files");
 +var BinaryValueObject = Java.type("com.ergotech.vib.valueobjects.BinaryValueObject");
 +var LongValueObject = Java.type("com.ergotech.vib.valueobjects.LongValueObject");
 +var arrayOfBytes = Java.type("byte[]");
 +
 +recipe = Files.readAllBytes(java.nio.file.Paths.get("DemoPPBody.rcp"));
 +// Compress the bytes
 +output = new arrayOfBytes(2000);
 +compresser = new Deflater();
 +compresser.setInput(recipe);
 +compresser.finish();
 +compressedDataLength = compresser.deflate(output);
 +compresser.end();
 +outArray = new arrayOfBytes(compressedDataLength);
 +java.lang.System.arraycopy(output, 0, outArray, 0, compressedDataLength);
 +
 +// save the length of the compress recipe to the PLC using a server called "CompressedRecipeLength"
 +CompressedRecipeLength->setValueObject(new LongValueObject(compressedDataLength));
 +
 +new BinaryValueObject(outArray);  // will be writen to the server
 +</code>
 +
 +The inverse of the above code reads the bytes from the PLC and stores them to a file.
 +
 +<code>
 +var Deflater = Java.type("java.util.zip.Deflater");
 +var Inflater = Java.type("java.util.zip.Inflater");
 +var Files = Java.type("java.nio.file.Files");
 +var BinaryValueObject = Java.type("com.ergotech.vib.valueobjects.BinaryValueObject");
 +var StringValueObject = Java.type("com.ergotech.vib.valueobjects.StringValueObject");
 +var arrayOfBytes = Java.type("byte[]");
 +
 +// read the length of the compress recipe from the PLC using a server called "CompressedRecipeLength"
 +CompressedRecipeLength->triggerRead();  // force an update
 +compressedDataLength = CompressedRecipeLength->getIntValue(); // and read the latest value.
 +
 +java.lang.System.out.println  (" Compressed DataLength " + compressedDataLength);
 +// Compress the bytes
 +output = new arrayOfBytes(2000);
 +inflater = new Inflater();
 +buf = incomingValue.getBinaryValue();
 +
 +inflater.setInput(buf,0,compressedDataLength);  // assumes that the compressed data length is always less than the length read from the server (setLength))
 +
 +resultLength = inflater.inflate(output);
 +inflater.end();
 +
 +// trim the array to the size of of the output
 +outArray = new arrayOfBytes(resultLength);
 +java.lang.System.arraycopy(output, 0, outArray, 0, resultLength);
 +
 +Files.write(java.nio.file.Paths.get("DemoPPBody.rcp.out"), outArray);
 +
 </code> </code>
  
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