Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 82)

Introduction to Programming
Chapter 4
4Ć18
If found, the rung containing the first occurrence of the address and/or
instruction will be displayed as well as the rungs after it. If the SEARCH
key is pressed again, the next occurrence of the address and/or instruction
will be displayed. When it cannot be located or all addresses and/or
instructions have been found, a NOT FOUND message will be displayed.
If the instruction is found in the subroutine area or past the temporary end
instruction, the area in which it is found will be displayed in the lower
portion of the screen.
This function can be terminated at any time by pressing [CANCEL
COMMAND]. All other keys are ignored during the search.
First or Last Instruction in a Rung
The first condition instruction of a rung can be addressed from anywhere
in the rung by pressing [SEARCH][
←
] when in program mode. If not in
program mode, the cursor will move off the screen to the left. To bring it
back on the screen, press the [
→
] key.
The output instruction can be accessed from anywhere in the rung by
pressing [SEARCH][
→
] in any mode.
Single Rung Display
Upon power-up, a multiple rung display appears on the screen.
The user has the option of viewing a single rung by pressing
[SEARCH][DISPLAY]. To return to the multiple rung display, press
[SEARCH][DISPLAY] again.
Incomplete Rung
In the event that an interruption in programming occurred and a rung was
inadvertently left without an output instruction, this rung can be located by
pressing the [SHIFT][SEARCH] keys. The processor can be in any mode.
Programming interruptions are further described in Section 4.4.4.
First and Last Rung and User Program Boundaries
Program boundaries including the first or last rung can be located from any
point in the user program by using the [SEARCH][
↑
] or {SEARCH][
↓
]
key sequences. The user program could contain a temporary end
instruction boundary and/or a subroutine area boundary. It always contains
an end statement boundary.