The AXC 3050 controller under PC Worx
8686_en_01 PHOENIX CONTACT 93
4.16 Function blocks for Axioline/acyclic PDI communi-
cation
In order to provide a flexible and universal option for the applicative parameterization of
Axioline F modules, function blocks are available for PDI communication. These blocks en-
able both startup parameterization and online parameterization, i.e., parameterization dur-
ing runtime. However, PDI communication blocks are not necessarily required just for pa-
rameterization operations, they may also be required for special Axioline F modules for
actual operation (e.g., for an RS-232 special function module where the communication
data is not exchanged between the controller and Axioline F module via process data but
by means of objects via PDI). Because PDI is a connectionless protocol, no function blocks
are required for connection establishment and release, i.e., function blocks only need to be
implemented in the project to read and write PDI objects. To this end, the PDI_READ and
PDI_WRITE function blocks are available.
Table 4-11 Overview of the function blocks
Function block Short description
PDI_READ The function block enables PDI objects to be read from local
Axioline F devices.
PDI_WRITE The function block enables PDI objects to be written to local
Axioline F devices.
The function blocks are described in the PC Worx online help.
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