Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 95)

Introduction to Programming
Chapter 4
4Ć31
Table 4.E
Clear Memory Functions 1
Function Mode Key Sequence Description
Data Table Clear Program [CLEAR MEMORY] [7] [7]
[Start Address]
[End Address]
[CLEAR MEMORY]
Displays a start address and an end address field.
Start and end word addresses determine boundaries for
Data Table clearing.
Clears the Data Table within and including addressed
boundaries.
User Program Clear Program [CLEAR MEMORY] [8] [8] Position the cursor at the desired location in the program.
Clears User Program from the position of the cursor to
the first boundary TEMPORARY END, SUBROUTINE
AREA, or END statement. Does not clear Data Table or
Messages.
Partial Memory Clear Program [CLEAR MEMORY] [9] [9] Clears User Program and messages from position of the
cursor. Does not clear Data Table.
Total Memory Clear Program [SEARCH] [ą]
[CLEAR MEMORY] [9] [9]
Position the cursor on the first instruction of the program.
Clears total memory (Data Table, User Program, and
Messages).
1 When Memory Write Protect is active, memory cannot be cleared except for Data Table addresses 010Ć377.
Data Table Clear
Part of all of the data table can be cleared by pressing [CLEAR
MEMORY] 77, entering a start and end word address, and then pressing
[CLEAR MEMORY] again. The data table will be cleared between and
including these two word addresses. When memory write protect is active,
the data table can be cleared only between and including addresses
010-377.
User Program Clear
Part or all of the user program can be cleared by pressing [CLEAR
MEMORY] 88. The user program will be cleared from the cursor position
to the first boundary: temporary end instruction, subroutine area or END
statement. Neither the data table nor messages are cleared.
Partial Memory Clear
Part of the user program and the messages can be cleared by pressing
[CLEAR MEMORY] 99. The user program and messages are cleared from
the cursor position which cannot be on the first instruction. None of the
bits in the data table are cleared.