13
Installation and Operation Manual
X-DPT-Profibus-Interface-eng
PN 541-C-068-AAG
November, 2008
• Global control commands (e.g. fail safe, sync).
• Get configuration (i.e. read number of I/O bytes and composition).
• Read diagnostics information (i.e. get error and alarm status).
• Set parameters (i.e. select gas number, engineering units, I/O configuration
• Set parameters (i.e. select gas number, engineering units, I/O configuration
etc.).
• Check configuration (i.e. check I/O composition).
These message types provides the user with the possibility to select a number
of operational settings, as well as to define which actual data are to be ex-
changed in the data exchange mode. This allows for the selection of only a
minimum of (required) data to be exchanged, thus conserving memory at the
master or for the selection of all the actual data. Diagnostics information can
be obtained when needed, providing information on device and process integrity
as well as communication integrity.
Additional features not available on the standard communication protocol
include fail safe option (i.e. pre-programmed device behaviour in case of a
network failure) and sync/unsync, allowing for synchronized behaviour for a
group of devices.
Calibration data as well as device data are not available through the Profibus-
DP communication, but will require a standard communication piggyback
board. Also Profibus-DP/V1 (extended Profibus-DP implementing a-cyclic data
transfer), or Profibus-FMS functionality are not implemented, although they can
be operated on the same network. Profibus-PA functionality, providing data
transfer on intrinsically safe networks is also not supported.
Finally the Profibus-DP piggyback board is equipped with a zero command
pushbutton, allowing the user to give a manual command to the device to
(re)balance the flow sensor electronics. This command can also be issued
through the protocol.
To Next Page
Loading...
