Siemens SIMATIC NET CP 343-1 Benutzerhandbuch

B3L−21

CP 343-1 Lean for Industrial Ethernet / Manual Part B3L

Release 03/2007
C79000-G8976-C198-04

Data exchange between a PROFINET IO controller and PROFINET IO device
involves the following procedure:

S On the PROFINET IO controller

Data exchange is initiated by the PROFINET IO controller that writes output

data to the configured output area (O addresses) and fetches input data from

the configured input area (I addresses).

S On the PROFINET IO device

Data is processed by the CP in the PROFINET IO device on the interface to the

PROFINET IO controller.
Communication within the PROFINET IO device involves calling the FCs

PNIO_RECV and PNIO_SEND in the user program of the CPU.

PROFINET IO

CP

CPU

STEP 7

user program

CP

database

PROFINET

IO controller

PROFINET IO device

Receive

Send

PROFINET IO

data areas (DB,

bit memory)

PNIO_RECV

PNIO_SEND

Process

outputs

Process

inputs

Configured 

O addresses

Configured 

I addresses

Figure 6-1

Interaction between PROFINET IO Device and PROFINET IO controller

Note
In the CPU of the device, the IO data areas for input data and output data are

transferred as an entire area to or from one of the data areas (DB, bit memory)

including any gaps.