Emerson PACSystems RX3i, User Manual

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RSTI-EP PROFINET I/O Controller User Manual Section 4
GFK-2571R May 2021
PROFINET System Operation 96
of immediately updating I/O data at the PROFINET Controller, as opposed to waiting for the
next normal I/O scan. The DO I/O function can also be used to obtain the latest input status
from the PROFINET Controller (see Section 5:, Diagnostics).
4.7.5 Scan Set I/O for Remote I/O Modules
The Scan Set I/O function of the PACSystems CPU requests the scanning of remote modules
that are members of a configured scan set. The Scan Set I/O function operates like a DO I/O
function, with the added ability to identify and group the modules to be scanned. Modules
are grouped according to their configured scan sets. As with the DO I/O function, the Scan
Set I/O function updates/consumes data stored in the local PROFINET Controller; it does not
directly update IO-Devices in remote nodes.
4.7.6 PACSystems CPU Defaults - Inputs
The PACSystems CPU defaults input data from remote I/O modules under the following
conditions:
• the remote module or PROFINET Controller has not yet come online following a
download of hardware configuration
• the remote module or PROFINET Controller has not yet come online following a power
cycle
• the remote module signals its input data is no longer valid (e.g. due to local module
fault)
• the remote module is extracted from the backplane
• the remote module loses power or otherwise fails
• the PROFINET Controller loses power or otherwise fails
• the PROFINET network connection (Application Relationship) associated with the input
data is lost.
The PACSystems CPU defaults the input values of an input module based on the input
default state configured for the I/O Device. Inputs may be configured to either Hold Last
State or Force Off (zero).
If a PROFINET Controller loses connections to an I/O device, the following actions occur:
1. The CPU defaults the input values of all input modules assigned to it within the IO
Device.
2. The PROFINET Controller logs a Loss of Device fault in its Local Log and in the CPU’s
I/O Fault Table.
3. The I/O point fault contacts for the I/O references and variables associated with the
IO-Device are set to the faulted state (if point faults are enabled on the CPU).