BECKHOFF FC5101 - Manual (Page 67)

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General Diag
The minimum and maximum bus loading are also displayed on the "General Diag" tab in addition to the current
bus loading, as are the cycle time and the failed cycle counter. In the example illustrated above, about 5000
CAN frames are handled each second, and a corresponding number of PDOs are sent. Because the firmware
sends all the pending PDOs in each cycle, the firmware cycle time in this case primarily depends on the time
required to transmit the PDOs.