Timeout on an SFC Step

The system can check timeout on any SFC "Sequential Function Chart" It can be used to program processes that can be split into steps. The main components of SFC are: - Steps with associated actions - Transitions with associated logic conditions - Directed links between steps and transitions step activity duration.

For that, enter this instruction in the main Action list of the step:

__StepTimeout ( timeOut , errString );

Where:

• timeout is a time constant or a time variable specifying the timeout duration.
• errString is a string constant or a string variable specifying the error message to be output

At runtime In computer science, runtime (or run-time) describes the operation of a computer program, the duration of its execution, from beginning to termination (compare compile time). Within KAS, runtime also refers to the virtual machine that manage the program written in a computer language while it is running, each time the activation time of the step becomes greater than the specified timeout:

• The error string is sent to the KAS-IDE "Integrated development environment" An integrated development environment is a type of computer software that assists computer programmers in developing software. IDEs normally consist of a source code editor, a compiler and/or interpreter, build-automation tools, and a debugger and shown in the Log window.

Log Message Strings

Sending log message strings to the log window requires the:

• Runtime In computer science, runtime (or run-time) describes the operation of a computer program, the duration of its execution, from beginning to termination (compare compile time). Within KAS, runtime also refers to the virtual machine that manage the program written in a computer language while it is running to be connected through ETHERNET.
• Runtime system supports plain text trace messages.

Important

You can put this statement within a #ifdef __DEBUG test so timeout checking is enabled only in debug mode.

Alternatively, if you need to make more specific handling of timeouts, you can enter this ST "Structured text" A high-level language that is block structured and syntactically resembles Pascal program in the N action block of the step:

if GSn.T > timeout then /* 'n' is the number of the step */
...statements...
end_if;