Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 314)

Chapter 17
Entering and Editing Your Program
17–2
File names appear in the lower left-hand corner of only two of the Start of
File screens. Program file 2 has the default name
MAIN_PROG since it is the
main program file, and file 3 has the default name USER_FAULT since this
program file is only executed when a fault occurs. (The program file names
can be changed using the programming software.)
End of File Screen
P 0 0 0 E N D
F I L E : 0 2
As the name implies, this screen signifies the end of a program file. If you
do not add any rungs to a program file, the End of File screen is labeled rung
0, as it is considered the only rung in the file.
Start of Rung Screen
P 0 0 0
The Start of Rung screen shows the Start of Rung (SOR) symbol. As the
name implies, this symbol indicates the start of a new rung.
Important: Every rung must begin with an SOR symbol. To add an SOR
symbol to the program file, press the key shown here:
NEW
RUNG
T
To create the first rung in the program file, you must press this
key while viewing the Start of File screen.
First Instruction on Rung Screen
P 0 0 0
I / 6 0
The First Instruction on Rung screen shows the SOR symbol to the left of the
first instruction entered onto the rung. For example, the screen above shows
the SOR symbol to the left of a LD instruction.