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Technical Information
Table 20
PROFIBUS STATE MACHINE
Status
POWER_ON
WAIT_PRM
WAIT_CFG
DATA_EXCH
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).
Message Mapping
The communication is based on the continuous data exchange capability of the
ProfiBus standard, where the master sends continuously the entire slave
configuration and reads back the entire slave status.
For this purpose one Input (from slave to master) and one Output (from master to
slave) buffers are provided. All the needed parameters are mapped inside each
buffer. The following tables reassume the ProfiBus parameter access, related to the
corresponding windows serial protocol.
The profibus communication and the serial communication use the same link
NOTA
inside of the controller, then you can not use at the same time the profibus
communication and the serial communication.
Agilent 4UHV Ion Pump Controller User Manual
Meaning
Interface set-up
Wait for parameterisation
from the master
Wait for configuration from
the master
Regular data exchange
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
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