Rockwell Automation 9323-PA2E APS SLC 500 Import/Export Utility User Manual - Manual (Page 62)

Creating an ASCII Archive File
5-27
Table 5.V
The Branch Types of the Ladder Rung
Structure
Types:
Branch Type
defined in
ASCII:
Notice this same
instruction in the
ASCII Program
File in Figure 5.2:
Branch Type in APS ladder
programming:
Notice this same branch type in
the APS Ladder Program in
Figure 5.2:
Branch Start BST BST A
A
Next Branch NXB B NXB B
Branch End BND C BND
C
Figure 5.2
Illustrating the Branch Types of the Ladder Rung
APS Import Utility
converts ASCII
Program File into
APS Ladder Program.
ASCII Program File
SOR BST A NXB
B NXB
C BND
Dąąā
EORą
APS Ladder Program
A
B
C
D
Example ASCII Program and APS Ladder Rung
Figure 5.3 shows an example program first in ASCII file format, then in ladder
format. The program consists of an input and output instruction list. Also included
in the program is a timer instruction (TON). (You can leave the input instruction list
empty, but not the output instruction list.) Use table 5.W to understand the
comparisons made between the two programs in figure 5.3.
Note In APS, you can nest only four levels of branches.