BECKHOFF FC5101 - Manual (Page 22)

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"FC510x" tab
PCI Slot/Irq:
Shows in which logical PCI slot the card was detected and which IRQ is assigned to it. The IRQ is unused.
Master Node Id:
Node address for the FC510x. Value range: 1...127. Determines the identifier of the master heartbeat telegram.
Ensure that it is not the same as a slave node address.
Baud rate:
Set the Baud rate here. Automatically tests whether the connected slave also supports this baud rate.
Synchronization Mode:
The synchronization mode determines the accuracy of the CANopen SYNC telegram generation.
The highest priority task linked with the FC510x device controls the CANopen card and is thereby synchronized
with the fieldbus. All other tasks are served asynchronously via corresponding buffers. For all operating modes
you can individually set the communication type for each process data object (PDO) - event driven or synchro-
nized (in each PDO tab). If one of the PDOs has been configured for synchronous operating mode, a SYNC
telegram is sent at the start of the cycle, which the slaves use to synchronize their actions with the master cy-
cle.
Depending on the sync accuracy requirements of the application several modes can be selected. Please note,
that due to CAN technology a single SYNC telegram may jitter for one entire frame length it the bus is busy at
the time of sync generation. The SYNC accuracy therefore refers to the long time stability. Bus nodes that use
a phase locked loop (PLL) mechanism to synchronize themselves require a maximum long time stability or
accuracy of the SYNC.