Siemens 6GA7202-2AA10-1BF1, Руководство по эксплуатации, Страница: 128 / 168

9.1.4 Data processing and handshake
Continuous data exchange between camera and PROFINET controller
A simple handshake mechanism is necessary for continuous data exchange between the camera
and the PROFINET controller.
The camera sends new process data only when the transferred data has been confirmed by the
recipient. To achieve this, the consecutive number in the data packets is used as the
acknowledgement signal. This means that the consecutive number of the transferred packet in
byte 1 of the "Send" user data interface is returned as an echo in byte 1 of the "Receive" user data
interface.
This consecutive number can also be used to detect when new data has been sent by the camera.
• When the value of the consecutive number in byte 1 = 0, this signals the end of the current
data transfer to the PROFINET controller.
• When the value in byte 1 = 1, the camera indicates that valid process data is available and can
be used by the PROFINET controller.
Sequence for one-time data exchange
The sequence for one-time data exchange is as follows:
1. The camera sends new process data byte 1 (send) = 1.
2. The PROFINET controller acknowledges with byte 1 (receive) = 1 and requests a new frame
from the camera in byte 4 (receipt) = B#16#81.
3. The camera acknowledges and terminates the current data transfer with byte 1 (send) = 0.
4. The PROFINET controller acknowledges with byte 1 (receive) = 0 and requests a new frame
from the camera in byte 4 (receipt) = B#16#81.
This sequence is then repeated continuously.
9.1.5 Control functions via PROFINET IO
The following control functions are available:
• Select program
• Start processing
Connection to a controller
9.1 Connection via PROFINET IO
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Operating Instructions, 07/2021