Single Master System

The single master system is the simplest version of a PROFIBUS network. It consists of a class 1 DP master and one or more DP slaves. Up to 31 DP slaves can be connected to the bus without using a repeater. If the number of bus segments is increased by means of repeaters, up to 126 DP slaves can be handled. The line ends of the bus segments have to be terminated using bus terminating resistors.

The DP master of class 1 is able to:

1. Parameterize DP slaves (e.g. timing supervision bus interchange). “bus interchange” means e.g. data and control Exchange on the Profibus.

2. Configure DP slaves (e.g. type / number of channels).

3. Read input and output data of the DP slaves.

4. Write output data of the DP slaves.

5. Read diagnosis data of the DP slaves.

6. Send control commands to the DP slaves (e.g. freezing input signals).

Single master system example