HMS Anybus X-gateway CANopen, Руководство пользователя

Страница: 8 / 62

Description
6 (60)
2.2 Data Exchange
The terminology and definitions used for different types of data vary between network types. All data
transported through the Anybus X-gateway CANopen are fast, cyclic data, and will in this document
simply be referred to as “I/O data”.
Primary Network Interface Secondary Network Interface
Primary Network
Secondary CANopen Network
Data From
Primary
Network
Data From
Secondary
Network
Data To
Primary
Network
Data To
Secondary
Network
Status Word
Status Word
Control Word
Control Word
Fig. 2 Data exchange example
Each of the two network interfaces exchanges data on its network through its own buffer, which
can hold up to 512 bytes of data. The first two bytes in the primary network buffer are reserved
for the Control Word and Status Word, leaving 510 bytes available for I/O data.
The actual amount of data that can be exchanged depend on the application and network used
and may therefore be less than 510 bytes, which is only the maximum size of the buffer.
The Control Word can be used by the master on the primary network to start and stop the
exchange of data, and to reset the X-gateway if needed. The Status Word can be used by the
master to read the status of the secondary CANopen network.
The I/O data exchange is separated from the network data exchange. While the gateway ensures
data consistency (where applicable), it does not feature any mechanisms for synchronisation
between the primary and secondary networks.
Anybus ® X-gateway ™ CANopen ® PROFINET ® IRT (2.32) User Manual
SCM-1202-029 1.2 en-US