Diagnosis in the Application :

in the application Clear

in the application to query

AL Status The ALStatus property returns any errors at the start of the stack. For example, configuration errors at the slave instance are displayed. Tip The AL status messages are also recorded in the

applications that you enable [...] by the application takes place via [...] in the application program

. For standard applications

: The application is in online

 61131-3 application Optional

: The application is in online

for standard applications