Omron GRT1-PNT - DATASHEET 2 Operation Manual page 48

Setting up the PROFINET IO network
2-5-3 PROFINET IO Controller redundancy
36
Switch
In case a connection fails, MRP Ring Redundancy ensures communication to
all devices through the alternative path.
The PROFINET IO Controller redundancy feature ensures seamless change-
over of active PLC / IO Controller to the standby PLC / IO Controller in case of
malfunction. To support the PROFINET IO Controller redundancy, a
redundancy Function Block can be downloaded from the OMRON website.
Both the active as the standby IO Controller have data exchange with all IO
Devices in the network. Only the active IO Controller is in control of the output
of the IO Devices.
In case of malfunction of the active IO Controller, the Function Block will
transfer control to the standby PLC system. In order to avoid momentary
changes in output data during this control change, the Data Hold parameter
should be set high enough for the standby IO Controller to take over. This
value should be determined experimentally.
For details about setting the PROFINET IO Controller redundancy refer to
PROFINET IO Controller manual (W12E).
Switch
Switch
Section 2-5
Switch