27
ifm
Programming Manual AS-i Gateway AC14 (4.2.x)
12/2017
Programming
Access input and output data
>
7.3
Access input and output data
Options to access input and output data ................................................................................................27
Validity of the interface data ...................................................................................................................28
Process data of the AS-i slaves .............................................................................................................29
Fieldbus data ..........................................................................................................................................31
17447
► Familiarise yourself with the following CODESYS functions!
Addresses according to IEC standard 61131-3:
→ Online help > CODESYS Development System > Programming Reference >
Operanden > Addresses
Access to IEC address via AT declaration:
→ Online help > CODESYS Development System > Programming Reference >
Declaration > AT Declaration
Definition of an ALIAS for an IEC address:
→ Online help > CODESYS Development System > Programming Reference > Data
Types > References
Coupling of a program variable to an address (mapping):
→ Online help > CODESYS Development System > Configuring I/O Links
>
7.3.1
Options to access input and output data
17621
In a CODESYS project, each input and output has a physical address according to the IEC standard
(e.g. %IW5). CODESYS offers the following options to access this address from a PLC application and
thereby to access the input and outputs data of the device:
Direct access to IEC address
Access to IEC address via AT declaration
Definition of an ALIAS for an IEC address
Link a program variable to an IEC address (mapping)
