Systems With One Rx3I Cpu And Two Profinet Controllers - Emerson PACSystems RX3i User Manual

RSTI-EP PROFINET I/O Controller User Manual
GFK-2571R
Figure 8 shows a programmer connection (for configuration, user logic programming, and
monitoring), the concept of GSDML import, an optional external Ethernet switch, and the
ability to connect field buses to a PROFINET IO-Device. Third-party IO-Devices that have only
one Ethernet port may require the use of an external switch.
Figure 8: RX3i System interfacing with Third-Party Devices and with PAC Machine
Edition Programmer
1.6.5 Systems with One RX3i CPU and Two PROFINET
Controllers
Both examples in this section show systems with one RX3i CPU that has two PROFINET
Controller modules. The PROFINET network can serve up to 63 IO-Devices (ring topology)
or 128 IO Devices (in star topology).
Note that multiple PNC001 modules in the same rack are not synchronized; that is, no two
PNC001 modules are guaranteed to power up at the same time. PNC001 configuration
differences (SFPs, etc.) can also cause variations in PNC001 power-up times.
If two (or more) PNC001 modules are in a main rack and devices owned by one PNC001 are
routed through the switch on a different PNC001 in the same rack, devices may show a Loss
of Device fault followed by an Addition of Device fault during RX3i power-up because the
first PNC001 can power up before the second PNC001 has enabled its Ethernet switch,
causing the Loss of Device. Then when the second PNC001 powers up, the device will show
Introduction
Section 1
May 2021
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