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Rockwell Automation Publication 1756-RM010C-EN-P - August 2018
Chapter 1
Update Considerations
LINT Members Must Align on 8-byte Boundaries
Beginning with version 27 of the Studio 5000 Logix Designer application,
LINT members must be aligned on 8-byte boundaries, and User-defined Data
Types (UDT) that contain LINT members must be sized as a multiple of 8
bytes.
This change impacts your Logix Designer application project if any of the
following situations are true:
• You migrate a standard project, version 26 or earlier, to a redundancy
project that is version 30.051 or later, and you have LINT tags inside a
UDT.
• You migrate a redundancy project, version 24.052 or earlier, to a project
that is version 30.051 or later, and you have LINT tags inside a UDT.
• You use a tag with LINT members as a producer, and at least one
consumer (controller) has firmware earlier than version 27.
• You use a tag with LINT members as a consumer, and the producer
(controller) has firmware earlier than version 27.
For more information, see these resources:
•
Align LINT Members on 8-byte Boundaries on page 51
• Logix Designer online help topic: ‘LINT data types within this tag now
align on 8-byte boundaries. Check produce/consume connection’.
IMPORTANT
If you have User-defined Data Types (UDT) that contain LINT members, you
may not be able perform the online Redundancy System Update. See the
ControlLogix Redundancy User Manual, publication
1756-UM535
, on how to
install and update the modules, firmware, and application software versions
while offline.
IMPORTANT
If you attempt to perform a Redundancy System Update from version 24.05x
to version 30.051 or later, and you have LINT tags inside a UDT, the Lock for
Update attempt can fail.
Summary of Contents for ControlLogix 5570 series
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