Agilent Technologies 829-0027 Manual de usuario descargar pdf (Pagina 40)

Technical Information

State Machine

Tab. 1

Profibus State Machine RS485 State Machine

Status Meaning Status Meaning

POWER_ON Interface set-up POWER_ON Interface set-up

WAIT_PRM Wait for parameterisation from the

master

SRC_ADDR Search for the controller serial

address

WAIT_CFG Wait for configuration from the

master

IDENTIFY Identify controller model and

protocol

DATA_EXCH Regular data exchange DATA_EXCH Regular data exchange

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 RS-485 serial link in not established

 RS-485 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).

40/58 TSP Profibus Gateway User Manual / 87-900-119-01 (C)

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Agilent Technologies 829-0027 Manual de usuario Pagina 40