Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 162)

Chapter 8
Compiling and Saving a Program
8–4
[F2] Test Single Rung (SLC 5/02 Specific)
This option allows you to execute your program one rung at a time or a
section at a time. Use this function for debugging purposes.
Enable: When selected the size of your program increases by 0.375
instruction words per rung.
Disable: Test Single Rung is not available. This is the default selection.
Important: The HHT can save the program enabling Test Single Rung;
however, the Test Single/Rung mode is available with APS.
[F3] Index Checks (Index Across Files) (SLC 5/02)
This option allows you to use indexed addressing to address data table
elements outside of the base address data file. Refer to chapter 5 for more
information.
Allow : The processor will not verify if the indexed address, the sum of the
base address, and the offset value is in the same data file as the base address.
The processor does check to ensure that the indexed address is contained
within the data table address space.
Disallow : The processor performs runtime checks on indexed addresses to
ensure that the indexed address is contained within the same data file as the
base address. This is the default selection.
[F4] File Protection (SLC 5/02)
This function key toggles between Outputs, None, and All. This option
allows you to protect your data table files from external modification by
devices on the DH–485 network.
Outputs: Only the output file (O0) is protected from external data
modification. This is the default selection.
None: External devices may change any data address within the data table
files, including the output file (O0).
All: The entire data table is protected from external data modification.