Profinet Redundant Media; System Limits - Emerson PACSystems RX3i User Manual

User Manual
GFK-2737L
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1.5

PROFINET Redundant Media

For a full discussion of PROFINET Redundant Media and interactions with the controlling
RX3i CPU, refer to Chapter 6 of the PACSystems RX3i PROFINET Controller User Manual,
GFK-2571. The following topics are covered:
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1.6

System Limits

I/O Controllers will have limitations on the system they support. One of these limits is the
number of PROFINET submodules supported. In the RX3i PNS rack, each power supply or I/O
module is represented by one PROFINET submodule. The RX3i PNS uses four to six
submodules:
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Other limitations, such as the configuration and I/O sizes, are specific to the configuration
options chosen. Note that not every combination of options is supported in every system.
If the configuration uses all slots in every device with a large device count, the memory of
the I/O Controller system will be a limiting resource.
PROFINET Media Redundancy Protocol
MRP Failover Performance
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Bumpless Operation with MRP
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MRP Operation for I/O Update Rates of 16ms or Greater
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MRP Operation at I/O Update Rates Less Than 16ms
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Minimum I/O Rate When Configured in an MRP Ring
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Minimum I/O Update Rates for Bumpless Operation in a Ring Topology
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Third-party MRP Manager Use with PNC as MRP Client
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Ring Topology with One Controller
Ring Topology with Multiple Controllers
Setting Up Media Redundancy Protocol
Media Redundancy Setup for a PROFINET I/O Controller
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Sequence for Enabling Media Redundancy
Sequence for Replacing a Media Redundancy Manager
Procedure for Disabling Media Redundancy
two submodules for basic operation of the PNS module
two built-in port submodules that are always configured
up to two additional port submodules, one for each optional Ethernet port
configured
Jul 2022
Section 1