Custom attribute User-defined attributes are any application-defined or user-defined attributes that you can apply to POUs, actions, data type definitions and variables. You can query a user-defined a

Attribute: call_after_global_init_slot Important VAR_INPUT declarations in functions or methods that use the attribute lead to compile errors. Reason: Input variables are unknown in this case at the t

Attribute: call_after_init Important VAR_INPUT declarations in functions or methods which use this attribute lead to compile errors. Reason: Input variables are unknown in this case at the time of the

Attribute: call_after_online_change_slot Important VAR_INPUT declarations in functions or methods that use the attribute lead to compile errors. The reason is that in this case the input variables are

Attribute: call_before_global_exit_slot Important VAR_INPUT declarations in functions or methods that use the attribute lead to compile errors. Reason: Input variables are unknown in this case at the

Attribute: warning disable, warning restore The warning disable attribute has the effect that specific warnings are suppressed. The warning restore pragma reactivates a suppressed message. This attrib

Conditional Pragmas Important You use conditional pragmas in the implementations of ST POUs. CODESYS does not evaluate the conditional pragmas when you use them in the declaration part. The exception

Region Pragma The pragma is used to combine multiple lines in a text editor to a block. The block can be named. Region pragmas can also be nested. Code with region pragma: Expanded and collapsed views

Identifier Designation Rules and recommendations for the identifier designation for variables, constants, functions, function blocks, methods, and other objects :

Rules Rules for variables An identifier must not contain spaces or special characters. The underscore is recognized. For example, A_BCD and AB_CD are treated as two different identifiers. Multiple con