230 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix F MicroLogix 1400 Distributed Network Protocol
To generate an Analog Input Object from the DNP3 Subsystem in the
controller, you should configure Analog Input Object File Number in the DNP3
Slave Application Layer Configuration file.
When only one Analog Input Object File is configured, the Index number starts
from 0 for the configured object. 1 word is used for 1 Index of 16-bit Analog
Input Object, 1 double word is used for 1 Index of 32-bit Analog Input Object,
and 1 short float is used for 1 Index of Short Floating Point Analog Input
Object.
If 16-bit Analog Input Object File Number, 32-bit Analog Input Object File
Number, and Short Floating Point Analog Input Object File Number were
configured in the DNP3 Slave Application Layer Configuration file, the
starting index number of 16-bit Analog Input Object is 0 and the starting index
number of 32-bit Analog Input Object starts from the ending index number of
16-bit Analog Input Object.
For example, if 10 elements of 16-bit Analog Input Object were configured, 10
elements of 32-bit Analog Input Object, and 10 elements of Short Floating
Point Analog Input Object were configured, the index numbers are:
• 16-bit Analog Input Object: From 0…9
• 32-bit Analog Input Object: From 10…19
• Short Floating Point Analog Input Object: From 20…29
As an example, a configuration of 16-bit, 32-bit and Short Floating Point
Analog Input Object Files is shown below. Data File N14 has 10 elements, L15
has 10 elements and F16 has 10 elements accordingly. A total of 30 Analog Input
Object indexes are configured. Index 0 of the Analog Input Object is N14:0,
Index 10 is L15:0, Index 20 is F16:0 and Index 29 is F16:9.
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