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INTERNAL LINK STATE MACHINE
Status
POWER_ON
Interface set-up
SRC_ADDR
Search for the controller serial address
IDENTIFY
Identify controller model and protocol
DATA_EX
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 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
SRC_ADDR)
Meaning
state
(WAIT_PRM
or
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 summarise the ProfiBus parameter
access, related to the corresponding windows serial
protocol (for this protocol please refers to the serial
interface paragraph).
The interface doesn't any scaling operation on the
read/written parameters. It acts only as a gateway
between the ProfiBus network and the pump's
controller serial interface. As a consequence of this, the
scale and the meaning of some parameters depends
directly to the specific model of Turbo Pump controller
connected to the interface.
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TECHNICAL INFORMATION
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