Agilent Technologies Turbo-V 81-AG Notice De Mode D'emploi page 280

17 Technical Information
Profibus Option
Configuration
Before power-on the controller set the ProfiBus address by the 2
rotary switches.
Up to 126 different addresses (from 0 to 125) can be selected. The
address value sets by the 2 switches is expressed in hexadecimal
notation, so value from 00 to 7D are permitted; this setting is read by
the interface during the power-on phase, so any change of the switch
position after the power-on is ignored.
Software Operation and State Machine
From the software point of view, the interface can be seen as two
devices (one for ProfiBus and the other for the internal link) linked
together. Each device has its own state machine to manage the device
operation.
Figure 47
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