Pnio_Dev_Comm Function Block - GE PACSystems RXi User Manual

10.7.2 PNIO_DEV_COMM Function Block

The PNIO_DEV_COMM function block monitors communications between a specified PNC
and a specified IO-Device.
PNIO_DEV_COMM can be used by the application logic to take a corrective action or turn on
an indicator if a specific device fails. It might also be used by a custom HMI to show which
PROFINET IO-Device connections are currently established.
It is recommended that the All Devices Connected status bit be checked first to determine
whether all devices belonging to the PNC are functioning. If this bit is 0, indicating that one or
more devices is not OK, the PNIO_DEV_COMM function block can then be used to
determine which specific devices are not communicating. For details on this status bit, refer
to Section 10.8.2, PROFINET IO-Controller Status Reporting.
Parameters and Outputs of PNIO_DEV_COMM
PNIO_DEV_COMM returns a Boolean indication of whether or not a given PNC is currently
communicating with a specified IO-Device. The PNC is identified by the IO Controller input
parameter, which is a PNIO_CONTROLLER_REF data type. The IO-Device is identified by
the IODevice input parameter, which is a PNIO_DEVICE_REF data type.
PNIO_DEV_COMM has two Boolean outputs (in addition to ENO) labeled OK and Primary.
OK is set ON/true if the PNC is successfully communicating with the IO-Device, otherwise it
is OFF/false.
The application logic must identify the PNC and the IO-Device in a symbolic manner, passing
appropriate Reference ID Variables (refer to the following example) to the corresponding
input parameters.
Example
In the following sample logic, the RIV iolan_controller01_L3 is assigned to the PNC and the
RIV versamax_pns01_L3 is assigned to an IO-Device.
If the iolan_controller01_L3 PNC is communicating with the versamax_pns01_L3 IO-Device,
the Bool variable LC_PNC01_PNS01_Status is set on. In a simplex (non-redundant) system,
Primary is set to On if OK is set to on. .
GFK-2816F
Chapter 10. PROFINET IO-Controller Operation
August 2015 213