Installation manual

Publication 1747-RM001G-EN-P - November 2008
B-40 SLC Status File
S:16
and
S:17
Status Test Single Step - Start Step On - Rung/File
These registers indicate the executable rung (word S:16)
and file (word S:17) number that the processor executes
next when operating in the Test Single Step mode. To
enable this feature, you must select the Test Single Step
option at the time you save your program.
These values are updated upon completion of every rung.
Refer to word S:2/4 for more information. Your programming
device interrogates this value when providing “start step on
file x, rung y” status line information. There is no known use
for this feature when addressed by your ladder program.
••••
This feature is built into the SLC 5/03 and higher processors.
Selection is not required.
•••
S:18
and
S:19
Status and
Dynamic Config
Test Single Step - Breakpoint - Rung/File
These registers indicate the executable rung (word S:18)
and file (word S:19) number that the processor should stop
in front of when executing in the Test Single Step mode. To
enable this feature, you must select the Test Single Step
option at the time you save your program.
If both the rung and file number are 0, the processor steps to
the next rung only; otherwise the processor continues until
it finds a rung/file equaling the S:18/S:19 value.
The processor stops, then clears S:18 and S:19 when it finds
a match, while remaining in the Test Single Step mode. The
processor operates indefinitely if it cannot find the end
rung/file that you have entered. It operates until it finds a
match, receives a mode change, or powers down. See S:2/4.
Your programming device interrogates this value when
providing “end step before file x, rung y” status line
information. Your programming device also writes this value
when prompting you for “set end rung.” There is no known
use for this feature when addressed by your ladder program.
••••
This feature is built into the SLC 5/03 and higher processors.
Selection is not required.
•••
Table B.4 Status File Functions (Continued)
Address Classification Description Fixed
5/01
5/02 5/03 5/04 5/05