Tag recieving data from input as Ascii (int value)
but I want to convert Ascii to String to show as a character
*for example right now tag value is 65 and I want to convert to “A”
Thank you ,
Where ever you are using the value, in a script you can just use the chr() function to convert the value over to the Ascii character.
asciiString = chr(system.tag.readBlocking(['yourTagPath'][0].value)
Where do I put this code in design?
That depends on what you’re trying to accomplish with it.
Traceback (most recent call last):
File “”, line 2, in
AttributeError: ‘str’ object has no attribute ‘value’
change = system .tag.readBlocking(’[default]Modbus/UnitId 1/1_test1-1_test20’[0].value)
print str(change)
I put it in Script Console , the result is error
What’s the problem?
Your second. ) is in the wrong place. It should be
change = system.tag.readBlocking(‘[default]Modbus/UnitId 1/1_test1-1_test20’)[0].value
I follow your advice ,but the result still error
SyntaxError: ("no viable alternative at input 'print'", ('', 2, 0, 'print code\n'))
And then I try
tagValue = system.tag.readBlocking('[default]_Modbus_/UnitId 1/1_test1-1_test20/1_test2')[0].value
code = chr(tagValue)
print code
The result is error too.
Java Traceback:
Traceback (most recent call last):
File "", line 2, in
at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1422)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.coerce(PyArgumentMap.java:130)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:82)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:40)
at com.inductiveautomation.ignition.common.script.builtin.AbstractTagUtilities.readBlocking(AbstractTagUtilities.java:361)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
java.lang.ClassCastException: java.lang.ClassCastException: Cannot coerce value '[default]Modbus/UnitId 1/1_test1-1_test20/1_test2' into type: interface java.util.List
at org.python.core.Py.JavaError(Py.java:552)
at org.python.core.Py.JavaError(Py.java:543)
at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:190)
at com.inductiveautomation.ignition.common.script.ScriptManager$ReflectedInstanceFunction.__call__(ScriptManager.java:523)
at org.python.core.PyObject.__call__(PyObject.java:480)
at org.python.core.PyObject.__call__(PyObject.java:484)
at org.python.pycode._pyx9.f$0(<input>:3)
at org.python.pycode._pyx9.call_function(<input>)
at org.python.core.PyTableCode.call(PyTableCode.java:171)
at org.python.core.PyCode.call(PyCode.java:18)
at org.python.core.Py.runCode(Py.java:1614)
at org.python.core.Py.exec(Py.java:1658)
at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:276)
at org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.java:131)
at com.inductiveautomation.ignition.designer.gui.tools.jythonconsole.JythonConsole$ConsoleWorker.doInBackground(JythonConsole.java:605)
at com.inductiveautomation.ignition.designer.gui.tools.jythonconsole.JythonConsole$ConsoleWorker.doInBackground(JythonConsole.java:593)
at java.desktop/javax.swing.SwingWorker$1.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.desktop/javax.swing.SwingWorker.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: Cannot coerce value '[default]Modbus/UnitId 1/1_test1-1_test20/1_test2' into type: interface java.util.List
at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1422)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.coerce(PyArgumentMap.java:130)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:82)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:40)
at com.inductiveautomation.ignition.common.script.builtin.AbstractTagUtilities.readBlocking(AbstractTagUtilities.java:361)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.python.core.PyReflectedFunction.call(PyReflectedFunction.java:188)
... 19 more
Traceback (most recent call last):
File "", line 2, in
at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1422)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.coerce(PyArgumentMap.java:130)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:82)
at com.inductiveautomation.ignition.common.script.builtin.PyArgumentMap.interpretPyArgs(PyArgumentMap.java:40)
at com.inductiveautomation.ignition.common.script.builtin.AbstractTagUtilities.readBlocking(AbstractTagUtilities.java:361)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
java.lang.ClassCastException: java.lang.ClassCastException: Cannot coerce value '[default]Modbus/UnitId 1/1_test1-1_test20/1_test2' into type: interface java.util.List
This is giving you an error because system.tag.readBlocking needs a list, even if there's only one tag to read. Add square brackets around the tag name as below. Once this bites you enough times, you'll start to remember the first time--or at least that's the way it worked for me 
change = system.tag.readBlocking(['[default]Modbus/UnitId 1/1_test1-1_test20'])[0].value
1 Like
Apparently not.
Sorry for the buggy script @hydradenlon
1 Like