Rockwell Automation 9323-PA1E USER MANUAL APS 6.0 - Manual (Page 330)

Online Editing
17–9
Effects of Online Editing On Your System
The following section covers the effects of online editing on your system. Keep
these items in mind while using the online editing function.
System Impacts
•
The scan time and interrupt latency can be extended up to 10 ms when
accepting a rung, assembling or canceling edits. Use the following formula to
calculate the number of scans impacted:
# of rungs
50
+ # of ladder files (2Ć255) = Number of scans
impacted by an online edit
10 +
•
Memory Limitations - Online editing can be performed until the program area
in the processor is exhausted.
•
The program execution time will be increased up to 117
µ
s per edit rung. The
increased execution time occurs regardless of the current editing state. For
example, an IR pair will impact the execution time of the program by 234
µ
s.
•
If only one MCR instruction exists in your program, the END instruction acts as
the second unconditional MCR instruction and all of the rungs following the
first MCR instruction execute via the current MCR instruction state.
Communication Break
If a communication break or other critical errors occur while the processor is
receiving online edit changes from APS, the default user program will be loaded
into the processor. However, APS retains your online editing changes in an archive
file ($$$.ACH). This file contains the latest program file contained in APS and the
current data table values.
To restore the $$$.ACH file:
1. Go to the offline edit mode and verify that the $$$.ACH file is correct.
2. Rename the archive file to your original processor filename.
a. From the main menu, press [F7], File Options then [F3], Rename.
b. Press [F1], Processor Memory File.