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Chapter 4 Deployment of the CPU 821xNET
4-30
• A station transmits two or more messages and the receiver did not have a
chance to accept them. Then the reception of the unknown data type
would cause collisions in the receiver. However, the CP prevents this. The
PLC application requires a defined size for the reception of data and the
wildcard length is not permitted. The size of the receive block of Prio1 -
RECEIVE jobs is defined implicitly by the pre-defined block size (16, 32,
64, 128, 256, 512Byte).
• Advantech recommends the use of acknowledgment messages on the
user level to ensure that data transfers are one hundred percent safe.
• Please regard, that the Port 7777 is used by WinNCS for
communication. This may not be occupied by other applications!
ADAM 8000 Manual CPU 821x – Rev 1.1
CPU ADAM 821x
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