Output Control - GE RX3i PROFINET User Manual

Output Control

5.2.5
If an output module has not been configured since being powered up, it remains in its hardware default
condition. If an output module has been configured, the configuration will specify the output action when
communication with the I/O Controller is lost. This is typically one of the following:

transition to the zero state

default to a specified state or value, or

hold the last given state or value.
Simplex Connections
5.2.5.1
For simplex PROFINET connections (one I/O Controller connection to the RX3i PNS), communications with
the I/O Controller are lost when no message has been received from the I/O Controller in a number of I/O
Update periods (typically three).
Redundancy Connections
5.2.5.2
For PROFINET system redundancy connections, the configured output action is applied immediately by
the PNS whenever the controlling Primary connection is lost and no matching Backup connection is
established. A Primary connection is lost if no message is received from the Primary IO-Controller within a
defined number of I/O Update periods.
If the Primary connection is lost in PROFINET system redundancy but a matching Backup connection
exists, outputs are held at their last given value for a period of time to allow the Backup connection to be
switched into the Primary role. The period allowed is calculated by the configuration tool. (Proficy Machine
Edition uses the CPU sweep rate, I/O Update Rate, network loading, and values from the GSDML to
generate this value). If the Backup connection does not switch to Primary within this period, the RX3i PNS
terminates the connection and follows the rules for when no connections exist. If the Backup connection
is lost during this period, outputs immediately follow the rules for when no connections exist.
For a full discussion of PROFINET Redundancy and interactions with the controlling RX3i CPU, refer to
Chapter 6 of the PACSystems RX3i PROFINET Controller User Manual, GFK-2571.
GFK-2737F December 2016
Chapter 5. Operations
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