Agilent Technologies TV 301-P Navigator Notice De Mode D'emploi page 204

17 Technical Information
Profibus
Figure 20
Table 9
Status
Power on
Src addr
Identify
Data ex
The two machines continuously share I/O data with the relative bus,
and interact each other only in following conditions:
ProfiBus Data Exchange is suspended (static diagnosis activated)
if the internal serial link in not established
Internal serial link Data Exchange is suspended (only for output
data) if the ProfiBus State machine is not in Data Exchange mode
As a general rule, unrecoverable communication errors make each machine
to jump to the state immediately following the power-on state (WAIT_PRM or
SRC_ADDR)
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Internal link state machine
Meaning
Interface set-up
Search for the controller serial address
Identify controller model and protocol
Regular data exchange
TV 301-P Navigator Controller User Manual / 87-901-001-01 (B)