Agilent Technologies TMP Profibus Gateway Manual De Instrucciones página 159

Table 2
ProfiBus state machine
Status Meaning
Power-on Interface set-up
WAIT_PRM Wait for parameterisation from
the master
WAIT_CFG Wait for configuration from the
master
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:
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).
TMP Profibus Gateway User Manual / 87-900-976-01 (F)
State Machine
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
Technical Information
RS485 state machine
Status Meaning
Power-on Interface set-up
SRC_ADDR Search for the controller serial
address
IDENTIFY Identify controller model and
protocol
DATA_EXCH Regular data exchange
18
State Machine
159/178