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System variables and status information
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4.2 Status information of each PROFINET device
(ILC 330 PN / ILC 350 PN)
The “~PNIO_DATA_STATE” byte that contains the corresponding status bits is available for
every PROFINET device. A PROFINET device only provides valid data if this bit is set. Hide
bits that are not described in the control program by linking to a corresponding bit mask.
These variables can be linked as process data.
PNIO_DATA_VALID For PROFINET, it may be normal during operation that a PROFINET device within the
network cannot be accessed (e.g., undocking devices).
Furthermore, applications are conceivable which cannot be implemented with INTERBUS.
For example, in the event of a device failure it can be ensured that the operation of all other
PROFINET devices remains unaffected.
This means that an application program must know whether or not a PROFINET device is
supplying valid data. This is why each device has a “PNIO_DATA_VALID” process data
item.
PNIO_APPL_RUN The display of this bit is interesting, for example, if controllers will be used as PROFINET
devices in future. This bit would then indicate whether or not the control program is running
on the PROFINET device.
PNIO_NO_DIAG If this bit is set, the device diagnostics can be read from the PROFINET device using a
special function block in an additional implementation step of the basic system if additional
information on the error that occurred is required in the control program.
Table 4-14 Status information variables of a PROFINET device
Variable Type Meaning
~PNIO_DATA_STATE BYTE Status of a PROFINET device
PNIO_IS_PRIMARY BOOL Reserved
PNIO_DATA_VALID BOOL This bit must be set for the PROFINET device to supply
valid data and all other process values to be valid.
PNIO_APPL_RUN BOOL Application running on the PROFINET device.
PNIO_NO_DIAG BOOL If this bit is set, there are no device diagnostics present.