PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
103
Communication using function blocks
6
6.1 Communication via Function Blocks
Introduction
Communication between the CPU, the CP 340 and a communication partner takes place via
the function blocks and the protocols of the CP 340.
Communication between CPU and CP 340
The function blocks form the software interface between the CPU and the CP 340. They
must be called up cyclically from the user program.
Communication between CP 340 and a Communication Partner
The protocol conversion takes place on the CP 340. The protocol (3964(R) procedure, ASCII
driver, or printer driver) is used to adapt the CP 340 interface to that of the communication
partner.
This enables the CP 340 to be linked to all communication partners which support the
standard protocols (3964(R) procedure, ASCII driver or printer driver).
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