Communication Via Function Blocks - Siemens Simatic S7-300 CP 341 User Manual

Communication via Function Blocks

Communication between the CPU, the CP 341 and a communication partner takes place via
the function blocks and the protocols of the CP 341.
Communication between CPU and CP 341
The function blocks form the software interface between the CPU and the CP 341. They
must be called in cycles from the user program.
Communication between CP 341 and a communication partner
The transmission protocol conversion takes place on the CP 341. The protocol is used to
adapt the interface of the CP 341 to the interface of the communication partner.
This enables you to link an S7 programmable controller with any communication partner that
can handle today's standard protocols available in SIMATIC S5 (ASCII driver, 3964(R)
procedure, RK 512 computer link, or printer driver).
Interrupt response
Calling the CP 341 function blocks in process (OB 40) or diagnostic (OB 82) interrupts is not
permitted.
The function blocks P_SND_RK and P_RCV_RK of the CP 341 may only be called in one
and the same execution level.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
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