Allen-Bradley MicroLogix 1200 Reference Manual page 344

22-12 Data Logging (MicroLogix 1500 1764-LRP Processor only)
Table 22.5 Command Structure
DST SRC CMD 0f
Field
DST
SRC
CMD
STS
TNS
FNC
Byte Size
File Number
File Type
Element Number
Sub/Element Number
Publication 1762-RM001C-EN-P
Information for Creating Your Own Application
Controller Receives Communications Packet
STS TNS
Function
Destination Node
Source Node
Command Code
Status Code
Transaction Number
Function Code
Number of bytes to be read
Queue number
Table 22.6 Equation
Record Field 1 + Record Field 2 + Record Field 3 ... + Record Field 7
Table 22.7 Record Field Sizes
Data Type
Word
Long Word
Date Field
Time Field
The formatted string length cannot exceed 80 bytes in
NOTE
length.
The last byte will be a zero value representing the
NOTE
terminator character.
FNC A2 Byte Size File No.
Description
Set to zero (0)
Always 2 bytes
Formatted string length (see equation below)
Always set to zero (0)
Must be A5 (hex)
Determines the queue to be read (0 to 255)
Always set to zero (0)
Maximum Size
7 bytes (characters)
12 bytes (characters)
11 bytes (characters)
9 bytes (characters)
File Tpe Ele. No. S/Ele. No.
= Formatted
String Length