Beckhoff CX-B510 Series, Руководство пользователя

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Error handling and diagnostics
CXxxxx-M510/B510 76 Version: 1.0
6.4 PDOs
SendCounter
TxPDOs feature an additional SendCounter variable under the Control menu item.
The output variable is incremented by one whenever a PDO is sent.
ReceiveCounter
RxPDOs feature an additional ReceiveCounter variable under the Status menu item.
The input variable is incremented by one whenever a PDO is received. In this way newly arrived PDO are
always logged, even if the data in the PDO are unchanged. The variable nevertheless indicates whether a
device still sends data on a regular basis. It is useful to link variable with the PLC and monitor it.