SmartPLC SafeLine AC4S with fieldbus interfaces
75
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8.2.5
Variable declaration with data transfer between standard and safety
area
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To be able to use the variable value in an application from the other area the variable always has to be
declared as exchange variable. Then the developer can use such a variable directly in the program
code of the standard application or the safe application.
If the developer first of all creates a variable in the declaration part of the POU and then
defines an exchange variable of the same name, CODESYS will generate an error message
during compilation of the application.
Example:
Task:
A non-safe Boolean value from the standard application is to be used in the safe application.
How to proceed:
1. Declare exchange variable of type BOOL in the exchange device [DataFromNonsafe] and update
variable list in [DataToSafe] (
→
Use the factory-set replacement variables
(
2. Assign a value to the variable in the standard application.
3. Use the exchange variable as source for FB or assignment in the safe application.
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8.2.6
Available memory space
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The following memory location is available to the user for programming safe applications on the
fail-safe PLC:
IEC program code: 384 Kbytes
IEC data: 128 Kbytes
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8.2.7
Pin safe project
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► Familiarise yourself with the following CODESYS functions!
Pin object
→ Online help > Add-Ons > CODESYS Safety > Pinning
When a safe application has been completed, the project must be pinned. The states of all objects of
the safe application are stored and saved against changes by means of a check sum.
