I/O Fault Contacts - GE PACSystems RX3i User Manual

Chapter 5. Diagnostics
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.
Hot Standby CPU Redundancy systems do not support output point faults. For details, refer to the PACSystems
Hot Standby CPU Redundancy User's Manual, GFK-2308.
In order to be used, I/O point faults must be enabled in the CPU configuration. For details, refer to the
PACSystems RX7i, RX3i and RSTi-EP CPU Reference Manual, GFK-2222 and to the PACSystems RX7i, RX3i and
RSTi-EP CPU Programmer's Reference Manual, GFK-2950.
106 PACSystems* RX3i & RSTi-EP PROFINET IO-Controller User Manual GFK-2571N