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en:mervis-ide:35-help:6-software_basic:5-common-elements:0-identifiers [2020/05/03 23:48]
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-====== Identifiers ====== 
- 
-An identifier is a string of letters, numbers, and underscores (_), used to name and identify following entities: 
- 
-  * [[:en:mervis-ide:35-help:6-software_basic:5-common-elements:6-constant|constants]] 
-  * [[:en:mervis-ide:35-help:6-software_basic:5-common-elements:5-variables|variables]] 
-  * [[:en:mervis-ide:35-help:6-software_basic:6-data-type:2-user_defined_data_types|derived data types]] 
-  * [[en:mervis-ide:35-help:6-software_basic:8-pou|functions, function blocks, and programs]] 
-  * [[:en:mervis-ide:35-help:2-plc:10-plc_prog_map|tasks]] 
- 
-A identifier must begin with a letter or underscore and must not contain spaces. National characters (accented characters) are not allowed in identifiers. Upper/lower case is not relevant.\\ 
- 
- 
-Example: 
- 
-<code> 
-IW215, QX75, IDENT, LIM_SW_5, abcd, ab_cd, _MAIN, _12V7 
-</code> 
  
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