IFM AC1401, Programming Manual

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ifm Programming Manual AS-i Gateway AC14 (4.2.x) 12/2017
Programming Create PLC application
>
7.2 Create PLC application
17691
► Familiarise yourself with the following CODESYS functions!

Program application
→ Online help > CODESYS Development System > Program application

Programming reference
→ Online help > CODESYS Development System > reference programming
To create a PLC application:
►
In device tree: Double-click on [PLC_PRG (PRG)]
> The editor window shows the programming surface:
► Program the application in the editor.
>
7.2.1 Use remanent variables
18522
The PLC of the device supports the use of remanent variables. Variables declared as VAR RETAIN
are stored in a memory area that is also maintained when the device is switched off.
The declaration of a variable as RETAIN also influences its behaviour when the PLC application is
reset (
→ Supported reset variants
(
→ p.
54 )).
The memory area for RETAIN variables comprises 4072 bytes.
► Pay attention to the maximum size of the RETAIN memory area when declaring RETAIN
variables!