Virtual slave interface for PROFIBUS

The virtual slave interface enables the creation of up to three virtual slaves on the same hardware interface. This enables the user to exchange more data with a PROFIBUS master or also to establish a connection with a second PROFIBUS master.

A maximum of 240 bytes of data can be configured for each slave, i.e. in total you can exchange 4 x 240 bytes of data in each direction.

Append a maximum of four CX8031 devices to your PROFIBUS device (fig. 1.0). Each of these devices is given a PROFIBUS address via the System Manager which can also be linked with the address selector (see Address switch). Append the process data under the box (figs. 1.1 and 1.2); these may not exceed 240 bytes of input data of 240 bytes of output data. For the PROFIBUS master configure each of the four slaves like an independent device.

It is also permitted to connect one or more slaves to a second PROFIBUS master. The master must support the multi-master capability. You do not need to make any further settings on the CX8031 for this.

Fig. 1.0 Creation of the 4 PROFIBUS slave devices

Fig. 1.1 Appending the PROFIBUS modules

Fig. 1.2 Selection of the PROFIBUS modules