
100
Rockwell Automation Publication 1756-RM100F-EN-P - October 2018
Chapter 5
Standard Application Conversion
Table 16
illustrates the hidden padding bytes that the Logix Designer
application automatically adds to achieve the 8-byte alignment and allocation
rules for a Logix Designer project, version 27 or later.
Consider the following:
• Padding is added in Word 5 so that MyLint starts at an 8-byte boundary.
• Padding is added in Word 9 so that the entire structure is a multiple of
8 bytes.
Table 16 - Hidden Padding Added for Logix Designer Projects, Version 27 or Later
Word
Elements
Byte Mapping Table
64 Bit Boundaries
0
LimitA and LimitB
Pad
Pad
Pad
Hidden
SINT
0
1
Profile (Real [3])
Map
Map
Map
Map
2
Map
Map
Map
Map
1
3
Map
Map
Map
Map
4
Interlock (Int)
Pad
Pad
Map
Map
2
5
Padding for 8-byte
alignment
Pad
Pad
Pad
Pad
6
MyLint (LINT)
Map
Map
Map
Map
3
7
Map
Map
Map
Map
8
Speed (REAL)
Map
Map
Map
Map
4
9
Padding for 8-byte
allocation
Pad
Pad
Pad
Pad
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