I/O Fault Contacts - Emerson PACSystems RX3i User Manual

RSTI-EP PROFINET I/O Controller User Manual
GFK-2571R
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5.4

I/O Fault Contacts

The PROFINET Controller sets I/O point fault contacts to the faulted state whenever an IO-
Device is not available or there is a problem with the I/O module.
If the control application needs to know whether a set of inputs is available or not, it must
refer to the input point faults. For example, immediately following a power cycle or recent
download of hardware configuration, the PACSystems CPU can go to Run mode before the
PROFINET Controller and its configured IO Devices are ready to transfer inputs. During this
time, the inputs for each IO-Device are defaulted and the corresponding input point faults
remain in the faulted state until both the PROFINET Controller and the IO-Device are ready
to transfer inputs. By inspecting the input point faults, the application can determine when
the inputs are ready to be consumed.
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Individual device statuses (as reported by the PNIO_DEV_COMM function block) are updated prior to the All Devices Connected bit.
Therefore, it is possible (depending on PNC loading) to see via the PNIO_DEV_COMM function block that every individual device is
connected while the All Devices Connected bit is not yet set. To avoid this inconsistency, it is recommended that the All Devices Connected
bit be checked first, before checking individual device connection status using the PNIO_DEV_COMM function block. For details, refer to
the section entitled
Block
PNIO_DEV_COMM Function
Diagnostics
Name Description
All Devices 1
9 communicating over PROFINET.
Connected
0 indicates no devices are configured or one or more configured
devices have not established a PROFINET connection.
Reserved Always 0.
MRP Enabled 0 indicates that MRP is not enabled.
1 indicates that MRP is enabled.
MRP Role If MRP is enabled:
0 indicates that the PROFINET Controller is currently an MRP
client (MRC).
1 indicates that the PROFINET Controller is currently the MRP
Manager (MRM).
If MRP is not enabled, this bit will be set to 0.
MRP Ring If MRP is enabled and the PROFINET Controller is currently the
Status MRM:
0 indicates that the ring is open (ring broken).
1 indicates that the ring is closed (ring complete).
If MRP is not enabled, or if the PROFINET Controller is an MRC, this
bit will be set to 0.
Reserved Set to 0
.
indicates all configured
Section 5
devices are connected
May 2021
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