Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 193)

Program Editing
Chapter 16
16-16
You must enter two types of information when programming the following
instructions:
Get
Equal
to
Less than
Timers
Counters
Files
Sequencers
The two types of information needed are the instruction and
operating parameters.
Important: Operating parameters are used only for file and
sequencer instructions.
The data stored at the instruction address is divided into two sections:
status bits (bits 14-17)
BCD values (bits 00-13)
During program execution,these bits are constantly changing to reflect
current states and values of program instructions. Therefore, when
programming on line, you must decide whether to use the current data or
enter new data.
Use [DATA INIT] when adding an instruction containing new data. Do
not use it when adding an instruction that uses the data at a
pre-assigned address.
The [DATA INIT] key performs two functions in the online
programming mode:
It allows entry of BCD data values (stored at the instruction address).
It resets status bits.
Use the [DATA INIT] key when programming a data instruction whose
address is not currently being used in the program. If you do not use
[DATA INIT], data at the new address (possibly remaining from previous
programming) may interfere with proper machine operation when you
insert the new instruction into the program.
Data Initialization Key