Hi,
I started doing some basic tests with the S7 protocol using a Siemens S7-300,
and the latest 0.7.0 release. The tests consist of reading and writing several
DB variables. I was able to read different datatypes, for instance:
builder.addItem("mivariable-1", "%DB20:DBX05.0:BOOL");
builder.addItem("mivariable-4", "%DB20:DBW06:INT");
However, when I try to write the same memory addresses I only manage to write
BOOL values, for example
builderWriter.addItem("mivariable-1", "%DB20:DBX6.7:BOOL", true); //WORKS OK
builderWriter.addItem("mivariable-4", "%DB20:DBW06.0:INT", (short)2); // FAILS
builderWriter.addItem("mivariable-2", "%DB20:DBB06:BYTE", (byte)0); // FAILS
I am unable to write any datatype different than BOOL.
I am facing the following Error message:
Exception in thread "main"
org.apache.plc4x.java.api.exceptions.PlcRuntimeException: Error initializing
field class PlcInteger
at
org.apache.plc4x.java.s7.readwrite.field.S7PlcFieldHandler.internalEncodeInteger(S7PlcFieldHandler.java:394)
at
org.apache.plc4x.java.s7.readwrite.field.S7PlcFieldHandler.encodeShort(S7PlcFieldHandler.java:86)
at
org.apache.plc4x.java.spi.messages.DefaultPlcWriteRequest$Builder.lambda$build$0(DefaultPlcWriteRequest.java:270)
at java.base/java.util.TreeMap.forEach(TreeMap.java:1002)
at
org.apache.plc4x.java.spi.messages.DefaultPlcWriteRequest$Builder.build(DefaultPlcWriteRequest.java:265)
at net.zylk.plc4x.test.protocols.WriteS7.main(WriteS7.java:102)
Caused by: java.lang.NoSuchMethodException:
org.apache.plc4x.java.api.value.PlcInteger.<init>([Ljava.lang.Short;)
at java.base/java.lang.Class.getConstructor0(Class.java:3349)
at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2553)
at
org.apache.plc4x.java.s7.readwrite.field.S7PlcFieldHandler.internalEncodeInteger(S7PlcFieldHandler.java:392)
... 5 more
Maybe I am misunderstanding the sintax and how the values should be written?
---
To try to offer some more information about this error:
Digging into that class (S7PlcFieldHandler) I saw that there are some fields
that are initialized based on the value of the datatype
case INT:
minValue = BigInteger.valueOf(Short.MIN_VALUE);
maxValue = BigInteger.valueOf(Short.MAX_VALUE);
fieldType = PlcInteger.class;
valueType = Short[].class;
castedValues = new Short[values.length];
break;
Then, the line that throws the Exception seems to be trying to inferr a
PlcInteger class constructor based on the datatype
// Create the field item.
try {
return fieldType.getDeclaredConstructor(valueType).newInstance(castedValues);
} catch (InstantiationException | IllegalAccessException |
InvocationTargetException | NoSuchMethodException e) {
throw new PlcRuntimeException("Error initializing field class " +
fieldType.getSimpleName(), e);
}
However there appears to be a "mismatch" between the valueType (Short[]) and
the constructor (Short) in the PlcInteger class, which leads me to think i am
missing something on the write value sintax?
Thank you in advance, any help will be welcome.
Iñigo
-----
the test class code:
public class WriteS7 {
private static final Logger _log = LoggerFactory.getLogger(WriteS7.class);
public static void main(String[] args) throws PlcConnectionException {
String connectionString =
"s7://10.105.143.1:102?remote-rack=0&remote-slot=0&controller-type=S7_300";
_log.info(String.format("Establishing connection to %s", connectionString));;
try (PlcConnection plcConnection = new
PlcDriverManager().getConnection(connectionString)) {
_log.info("Conecting... " + connectionString);
if (!plcConnection.getMetadata().canWrite()) {
_log.error(String.format("Connection %s doesn't support writing.",
connectionString));
return;
}
PlcWriteRequest.Builder builderWriter = null;
builderWriter = plcConnection.writeRequestBuilder();
// builderWriter.addItem("mivariable-26", "%DB20:DBX6.7:BOOL", false); //OK
builderWriter.addItem("mivariable-2", "%DB20:DBB06:BYTE", (byte)0); //FAILS
// builderWriter.addItem("mivariable-4", "%DB20:DBW06.0:INT", (short)2);
//FAILS
PlcWriteRequest writeRequest = builderWriter.build();
PlcWriteResponse writeResponse = writeRequest.execute().get();
GeneralFunctions.printPlc4XWriteReponse(writeResponse); //print response
}
}
}
-----------------------------------------
Iñigo Angulo
ZYLK.net :: consultoría.openSource
Ribera de Axpe, 11
Edificio A, modulo 201-203
48950 Erandio (Bizkaia)
+34 944272119
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