Agilent Technologies TwisTorr 74FS AG Rack Mode D'emploi page 276

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 44
Tab. 17
276/300
Profibus state machine
TwisTorr 74 FS AG Rack Controller User Manual / 87-901-055-01