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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
Internal serial link Data Exchange is suspended (only for
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 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.
TwisTorr 304 FS AG Rack Controller User Manual / 87-901-029-01
activated) if the internal serial link in not established
output data) if the ProfiBus State machine is not in Data
Exchange mode
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