Emerson PACSystems RX3i, User Manual

Page: 66 / 164

RSTI-EP PROFINET I/O Controller User Manual Section 3
GFK-2571R May 2021
Configuration 59
I/O Scan Set: The scan set for the PROFINET Controller defaults to scan set 1. Scan sets are
define
d in the CPU’s Scan Sets tab. The valid range is 1 through 32; the default value is 1.
Refer to the PACSystems RX7i and RX3i CPU Reference Manual, GFK-2222, for a discussion
of CPU scan sets.
The embedded PROFINET Controllers and the PNC001 behave the same as far as this
parameter is concerned.
Critical Network Ports: The default critical network port setting for all PROFINET Controller
ports is False. Setting one or more network ports on the PROFINET Controller as a critical
network port provides for triggering a CPU redundancy role switch when the last of all the
critical network port links associated with that PROFINET Controller are lost (disconnected).
Basically, when the last critical network port is disconnected from its network, a diagnostic
fault is logged by the PROFINET Controller. In a redundancy system, where the PROFINET
Controller is controlling redundant devices, this results in a fatal IOC Software Fault and a
Hot Standby CPU redundancy role switch with the CPU placed into Stop/Fault mode.
When using the critical network ports feature, the following PROFINET speeds are strongly
recommended:
PROFINET Network
Speed Recommended Network Type
100 Mbps Copper and/or Fiber based networks
1000 Mbps Fiber based networks ONLY.
Network ports 3 and 4 support fiber-based networks via the SFP
interface
Copper-based networks are not recommended at 1000 Mbps due to the extremely slow link
down detection associated with both fixed and SFP-based copper ports at this network
speed. Using copper-based networks at 1000 Mbps may result in the loss of I/O Devices
when the last critical network port is disconnected from the network. For this reason, the
PROFINET Controller has a built-in feature that forces any Cu port (fixed or Cu SFP) that is
configured as a critical port to 100M.
Note:
Critical network ports are allowed in simplex systems. However, the logging of the
diagnostic fault, when the last of the critical network ports is disconnected, does not
invoke any role switch, and does not place the CPU in Stop/Fault mode.
PROFINET Controller Parameters (Media Redundancy Tab)
By default, a PROFINET Controller is not set up for Media Redundancy. If the system will use
Media Redundancy (see Section 6:for more information), open the Media Redundancy tab
and select either Client or Manager:
Figure 44: Setting Media Redundancy Parameters