Siemens 6GK7242-7KX30-0XE0 사용자 설명서
Notes on operation and configuration
4.6 Data management in the process image
CP 1242-7
Operating Instructions, 03/2012, C79000-G8976-C247-03
Operating Instructions, 03/2012, C79000-G8976-C247-03
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The next time a connection is established to the telecontrol server, the buffered frames are
sent to the relevant destination subscribers.
The frame buffer is a ring buffer; if the buffer capacity is exceeded the oldest frames are
The frame buffer is a ring buffer; if the buffer capacity is exceeded the oldest frames are
discarded without any warning.
The maximum number of buffered frames can be found in the section Performance data
The maximum number of buffered frames can be found in the section Performance data
Monitoring and acknowledgement of send frames
The receipt of a frame is monitored and acknowledged in different ways. The mechanisms
differ depending on the recipients as follows:
● Recipient: Telecontrol server
● Recipient: Telecontrol server
After processing the send job, DONE is set to 1 in the "TC_SEND" instruction.
If there is a connection abort or the send monitoring time is exceeded, the frame is
If there is a connection abort or the send monitoring time is exceeded, the frame is
buffered and sent to the telecontrol server when the connection is re-established.
Receipt is acknowledged by a frame from the telecontrol server.
Receipt is acknowledged by a frame from the telecontrol server.
● Recipient: CP 1242-7 - "Telecontrol" mode
The frame is forwarded by the telecontrol server to the destination CP.
Receipt is acknowledged by a frame from the destination CP. DONE is only set to 1 in the
Receipt is acknowledged by a frame from the destination CP. DONE is only set to 1 in the
"TC_SEND" instruction after receiving the acknowledgement.
If there is a connection abort or the send monitoring time is exceeded, TC_SEND outputs
If there is a connection abort or the send monitoring time is exceeded, TC_SEND outputs
to the ERROR and STATUS condition codes. The sending of the frame is not
automatically repeated.
● Recipient: CP 1242-7 - "GPRS direct" mode
The transfer of the frame with the TC_SEND instruction to the CP firmware is monitored
and acknowledged by TCP mechanisms and DONE is set to 1 in the "TC_SEND"
instruction.
4.6
Data management in the process image
Data storage in the process image of the CP
Note
The process image on the CP is only created for communication with the OPC server of the
The process image on the CP is only created for communication with the OPC server of the
telecontrol server ("RemoteWdcAddress" in "TCON_WDC" = 0).
The data that the CP receives via GPRS and forwards to the CPU and the process data that
the CP receives from the CPU to forward via GPRS is stored as an image on the CP: