1-14 PACSystems* RX3i PROFINET Controller Manual – December 2011 GFK-2571A
One RX3i CPU with Four Controllers on Separate Networks
This example shows a system with one RX3i CPU node containing the maximum of four RX3i
PROFINET Controllers, with each PROFINET Controller connected to a different network. In this
architecture, up to 128 IO-Devices are allowed, spread across the four networks. Up to 64 IO-
Devices can be controlled by any given PROFINET Controller.
Note that multiple PNCs in the same rack are not synchronized such that all PNCs are guaranteed to
power up at the same time. PNC configuration differences (SFPs, etc.) can cause variations in PNC
power up times.
If two (or more) PNCs are in a main rack and devices owned by one PNC are routed thru the
switch on a different PNC in the same rack, devices may show a Loss of Device fault followed by
an Addition of Device fault during RX3i powerup because the first PNC can power up before the
second PNC has enabled its Ethernet switch, causing the Loss of Device. Then when the second
PNC powers up, the device will show a Addition of Device fault. Devices will function normally
once added.
Daisy-chain shown for clarity.
A star or ring topology is
preferred.
As in the other examples, third-party IO-Devices could be substituted for the VersaMax PROFINET
Scanners.
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