Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 191)

Program Editing
Chapter 16
16-14
Keystrokes: You can change the lower 12 bits of a word by performing
the following steps.
1. Position the cursor on the appropriate instruction and press
[SEARCH] 5 1.
The message “ON-LINE DATA CHANGE, ENTER DIGITS FOR:
<Required Information>” is displayed near the bottom of the screen. The
new digits are displayed in a command buffer as they are entered.
2. Press [INSERT] to enter the data into memory.
3. To terminate this function, press [CANCEL COMMAND].
ATTENTION: When the address of an instruction whose data
is to be changed duplicates the address of other instructions in
user program, this could cause unwanted machine operation.
This may result in damage to equipment and/or injury to
personnel. The consequences of the change for each instruction
should be examined beforehand.
Important: When the memory write protect is activated by the EEPROM
back-up memory, you cannot perform an online data change for addresses
above 177. If you attempt this change, the industrial terminal will display
the error message: MEMORY PROTECT ENABLED.
Online Programming
Online programming allows you to change the program during machine
operation (processor is operating in the run/program mode and memory
write protect is not active).
ATTENTION: Assign the task of online programming only to
an experienced programmer who understands the nature of
Allen-Bradley programmable controllers and the machinery
being controlled. Check and re-check proposed online changes
for accuracy. Assess all possible sequences of machine
operation resulting from the change in advance. Be absolutely
certain that the change must be done online and that the change
solves the problem without introducing additional problems.
Notify personnel in the machine area before changing machine
operation online.
To minimize the chances of error, maintain accurate data table assignments
sheets and use the data initialization key described in this section.