User`s manual

MGate 4101-MB-PBS UM Quick Configuration
A-4
PROFIBUS Slave
The following state machine helps illustrates how ProfiBus DP operates with respect to the slaves.
Note the four main states: Power ON/Reset, Parameterization, I/O Configuration, and Data Exchange.
The master uses the following general telegram sequence during startup:
1. Request Diagnostics.
2. Change Station Address (optional service, Class 2 Master only).
3. Parameterize the Slaves.
4. Configure the Slaves.
5. Request Diagnostics again before data exchange to ensure that system startup was OK.
6. Data exchange.
7. Global Control (optional).
Power ON/Reset State
The power on/reset state is the initial state following power up for the DP slave. In this state, the slave may
receive a telegram from a class 2 master to change its station address. A slave will be held in this state if it
does not have a valid address from 0-125. After completion of its power-on initialization routine and if the slave
has a valid station address, the slave will proceed to the Wait for Parameterization state.
Parameterization State
In this state, the DP slave awaits the parameterization telegram from the master which identifies the slave’s
master and the mode the slave is to operate in. A slave in this state will reject all other telegrams except a