Function Packages
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual Unrestricted 71
DC8-037-2.02, Edition 10.2017
Watchdog Timer
This function monitors the proper sequence of the task within its set cycle time. If the task is
not finished with its input handling, program processing and its output handling within this
time, the next cycle for this task is omitted and a time-out is signaled.
With serious time-outs, for example due to a malfunction, the reliability of the application pro-
gram becomes questionable. A time scale can be defined for such cases, the exceeding of
which leads to an error message and a controlled shutdown of parts or the entire application
program as well as all I/O Master Modules connected.
3.3.2.3 Loading Application Program
The initial loading of an application program is always associated with a startup.
Fundamentally however, the fault-free operation and consequently the availability of every
control or controller depends on the quality of the program – in other words the measure of
how free they are of formal and logical errors. The loading of error-burdened changes can al-
ways lead to interruptions to operation.
3.3.2.4 Test Functions
The entire functionality of the test functions applies to
• the engineering tool ("CAEx plus Online Test" of the SICAM TOOLBOX II or SICAM WEB)
• the online test function of the open-/closed-loop control function of the automation unit
While in the engineering tool all functions of the user interface can be found, the open-/closed-
loop control function provides functions for the execution of the operator inputs.
If for example a value is to be displayed, the selection of the value and its display takes place
in the engineering tool. For this purpose, the open-/closed-loop control function is given the task
of reading out the selected value and transmit it to the user interface.
In the following, those functions are listed that the test function of the open-/closed-loop control
function provides.
Display and Setting of Variables and Signals
• Display of variables and signals
• Single setting of variables (single forcing)
─ The value of a variable can change again at any time after setting, due to the function
of the program (“CAEx plus Online Test”)
─ The value of a variable remains maintained until the test mode is active (SICAM WEB)
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