Rockwell Automation 9323-PA2E APS SLC 500 Import/Export Utility User Manual - Manual (Page 61)

Preface
APS Import/Export Utility User Manual
5-26
Specifying the Ladder Program Files
The ladder program filename consists of the keyword “LADDER,” the file number
and, if included, the rung list. For example:
LADDER 3 SOR OTE B/0 EOR
Keyword Ladder File Number
Rung List
If you leave the rung list empty, the import utility creates the EOR instruction.
For MicroLogix 1000 controllers, files 2 to 15 are fixed ladder program files. For
all other controllers and processors you can specify program files 2 to 255 as ladder
program files.
A rung may consist of the following:
•
start of rung symbol (SOR)
•
input instructions
•
output instructions
•
end of rung symbol (EOR)
The import utility processes the rung left–to–right and top–to–bottom. Also, the
import utility processes each branch structure before proceeding to the next
instruction on a given line.
The ladder rung consists of three basic structure types described in table 5.V. Figure
5.2 shows a simple program before and after the import utility converts it from an
ASCII program file into an APS ladder program. Notice how the instructions and
structures in table 5.V correspond to the instructions in the ASCII program file and
the rung structures in the APS ladder program in figure 5.2.