Functional Overview; Data Exchange - HMS Anybus X-gateway CANopen Series User Manual

2.3 Functional Overview

Internally, the gateway consists of an intelligent gateway platform, an Anybus CANopen interface
an Anybus PROFIBUS interface. The CANopen interface and the Anybus PROFIBUS interface are in-
terconnected through the intelligent gateway platform, which basically forwards data from one network
to the other and vice versa as shown below. This design allows almost any other industrial network to
be connected to a CANopen master or a slave on a separate CANopen network.

2.4 Data Exchange

Each of the two network interfaces exchanges data on its network through two buffers. The gateway
forwards the data between these buffers as shown below. Note that this process is separated from the
network data exchange. While the gateway ensures data consistency (where applicable), it does not fea-
ture any built-in mechanisms for synchronisation between the CANopen network and the PROFIBUS
network.
Control Word
Data To
the CANopen
Network
CANopen Network Interface
Status Word
Data From
the CANopen
Network
Each buffer holds up to 512 bytes of data, where the first two bytes always are used for control/status
information. The remainder 510 bytes gives the theoretical upper limit for the number of data bytes that
1. When it is started the first time, the Anybus X-gateway is set as slave. This can be changed during configuration, see "CANopen Con-
figuration Example" on page 47. The module will remember its setting when restarted.
Anybus X-gateway CANopen - PROFIBUS
Doc.Rev. 1.02
Anybus X-gateway CANopen - PROFIBUS 8
Status Word
Data From
the CANopen
Network
Industrial Network Interface
Control Word
Data to
the Canopen
Network
1
and
Doc.Id. SCM-1200-080