Allen-Bradley ControlLogix 5570 Reference Manual page 100

Chapter 5 Standard Application Conversion
100
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
0 LimitA and LimitB
1 Profile (Real [3])
2
3
4 Interlock (Int)
5 Padding for 8-byte
alignment
6 MyLint (LINT)
7
8 Speed (REAL)
9 Padding for 8-byte
allocation
Rockwell Automation Publication 1756-RM100F-EN-P - October 2018
Byte Mapping Table
Pad Pad Pad
Map Map Map
Map Map Map
Map Map Map
Pad Pad Map
Pad Pad Pad
Map Map Map
Map Map Map
Map Map Map
Pad Pad Pad
64 Bit Boundaries
Hidden 0
SINT
Map
Map 1
Map
Map 2
Pad
Map 3
Map
Map 4
Pad