Get String value of a Enum in Twincat 3

Question

In Twincat 3 I have a Enum like this:

TYPE ENUM_FUNCTIONS :
(
EMPTY                       :=0,    
MOTOR_SPEED_INPUT_1         :=1,
MOTOR_SPEED_INPUT_2         :=2,
MAIN_SHAFT_SPEED_MONITOR_3  :=3,
MAIN_SHAFT_SPEED_MONITOR_1  :=4,
MAIN_SHAFT_SPEED_MONITOR_2  :=5
);
END_TYPE

Is there any way to get the String value of the Enum??

For example, use ENUM_FUNCTIONS[5] and get the value MAIN_SHAFT_SPEED_MONITOR_2

score 3 · Accepted Answer · edited Oct 14 '20 at 18:10

3

Yes. See here how to do it (only available since TwinCAT 3.1.4024.x or CODESYS 3.5.14.0)

TL;DR, in short, use the to_string attribute on the Enum and TO_STRING function to get the string:

{attribute 'to_string'}
TYPE ENUM_FUNCTIONS :
...
END_TYPE

myEnum: ENUM_FUNCTIONS;
str: STRING := TO_STRING(myEnum);

edited Oct 14 '20 at 18:10

Guiorgy

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answered Oct 13 '20 at 11:20

Jakob

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How do I get String in the position 5 of the Enum ?? – Adrian Garcia Oct 15 '20 at 11:10
`e: ENUM_FUNCTIONS := 4; ` `str: STRING := TO_STRING(e);` Keep in mind that this is only true **if you don't manually specify the enum member values** , because by default the first one will be equal to 0, then 1, 2 and so on! – Guiorgy Oct 15 '20 at 12:06
Forgot to mention, but if you get any error while trying `e: ENUM_FUNCTIONS := 4;`, then make sure you aren't using `{attribute 'strict'}` on your enum! – Guiorgy Oct 15 '20 at 17:48

Get String value of a Enum in Twincat 3

1 Answers1