Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 126)

Chapter 7
Creating and Editing a Program File
7–14
Modifying Rungs
In the previous two examples you created rungs by inserting them into the
program. After rungs are part of a ladder program, you can modify those
rungs offline, at any time.
Adding an Instruction to a Rung
In this example, add an examine if closed instruction to the first rung (rung
0) of your program. The modified rung should appear as follows.
] [
I:1.0
0
( )
O:3.0
0
] [
I:1.0
2
Add this instruction to the rung.
By adding an examine if closed instruction to this rung, you are creating a
rung of series logic, that is: when input I:1.0/0 and input I:1.0/2 are both
energized, output O:3.0/0 is energized.
1. From the previous display, press [ENTER] to display the additional menu
functions.
F1 F2 F3 F4 F5
>
2.0.0.0.*
OFL
] [ ( )
INS_RNG MOD_RNG SEARCH DEL_RNG UND_RNG
The cursor is located on the left
power rail of rung 0.
<
END
>
] [ ( )
] [
2. To place the new instruction between the existing input and output
instructions, press the [
→
] key twice to place the cursor on the output
instruction. The display changes as follows:
F1 F2 F3 F4 F5
>
2.0.0.0.2
OFL
] [ ( )
INS_RNG MOD_RNG SEARCH DEL_RNG UND_RNG
OTE:O0:3.0/0 NO FORCE
Notice that with the cursor placed
on the output instruction, the
instruction mnemonic and
address are displayed in the
upper left corner.
The cursor location is also
displayed in the upper right
corner. This indicates that the
cursor is located in program file
2, rung 0, nest level 0, branch
level 0 and on the second
instruction in the rung.
<
END
>
] [ ( )
] [
3. Press [F2] , MOD_RNG then [F1] , INS_INST, then [F1] , BIT for the
following display to appear:
I
F1 F2 F3 F4 F5
>
OFL
] [ I
] [ ( ) ]/[ ( ) L ( ) U
2.0.0.0.2
( )
OTE:O0:3.0/0 NO FORCE
<
END
>
] [ ( )
] [