PROFIBUS Manual

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Navigation: Introduction > System structure > Stations

Addressing stations

Every PROFIBUS station must have a unique address for communication. These PROFIBUS addresses are coded in one byte and comprise the range 0 - 127. However, individual address values are reserved and no longer free to be assigned.

Address	Use
0	is reserved as a rule for diagnostic tools, such as programming devices
1 ... n	Master station addresses should start with the lowest address. A single master will therefore have address 1. Additional master stations will have addresses 2, 3... etc.
n ... 125	This means that, in a PROFIBUS network with one master, no more than 124 addresses will be left free for slave stations.
126	is reserved as a delivery address (default) for stations whose address can be adjusted via the bus. This is explained in more detail in the chapter on address changes.
127	is reserved for addressing all or groups (broadcast) and cannot therefore be set for one station.

Infrastructural components like repeaters, couplers and fibre optic (FO) converters transmit telegrams transparently from one segment to another and therefore do not require their own address.