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Field bus design
The netX Network Controllers are equipped with flexible communication processors (XPEC/XMAC units, also referred to as XC units) that allow to realize virtually any fieldbus Interface on the market, by simply adding the appropriate physical layer circuit.
All common fieldbus interfaces are serial interfaces with a Transmit and Receive signal, while some of them use an additional control signal or status signal, hence the XMAC units that directly connect or the fieldbus physical layer circuit provide an XMi_TX, an XMi_RX and two I/O signals (XMi_IO0 and XMi_IO1), whereas currently only one of them is used by current fieldbus interfaces. On the netX 50, these I/O signals have been yet extended to a total of 5 signals for future use.
Each XC unit also provides a clock input / output signal (XMi_ECLK) that either allows to synchronize external hardware to the XC clock or feed an external clock to the XC unit. Both options are currently not used.
The following simplified example schematics shows the physical layer circuit for the different field bus interfaces. More detailed schematics are found in the Design in Guide.
AS interface
CANopen
DeviceNet
CC-Link
PROFIBUS
