Page 234 - Programmable Logic Controllers, Fifth Edition - Mobile version

Recipe A Location in RSLogix software
3452 #N7:10
6789 Length = 4 COP FLL DDV SCL INT STE STS STD PID
8321
Move/Logical File / Misc File Shift/Sequencer Prog
983
File-to-file copy Input Ladder logic program
L1
T4:0 preset value #T4:0.PRE A
T4:1 preset value Length = 4 A COP
T4:2 preset value File of timer preset values COPY FILE
Source #N40:1
T4:3 preset value Destination #N20:1
Length 6
File-to-file copy
Recipe B
778 N40:1 N20:1
#N7:20
986 Length = 4 N40:2 N20:2
342 N40:3 N20:3
N40:4 N20:4
135 N40:5 N20:5
N40:6 N20:6
Figure 10-14 Copying recipes and storing values for timer
presets. Figure 10-15 File copy (COP) instruction.

The exceptions to the rule that file addresses must take Location in RSLogix software
consecutive words in the data table are in the timer, coun-
ter, and control data files for the FAL instruction. In these COP FLL DDV SCL INT STE STS STD PID
three data files, if you designate a file address, the FAL in- Move/Logical File / Misc File Shift/Sequencer Prog
struction will take every third word in that file and make a
file of preset, accumulated, length, or position data within Input Ladder logic program
the corresponding file type. This might be done, for exam- L1
ple, so that recipes storing values for timer presets can be A FLL
moved into the timer presets, as illustrated in Figure 10-14. A FILL FILE
The file copy (COP) instruction and the fill file (FLL) Source N15:5
instruction are high-speed instructions that operate more Destination #N20:1 6
Length
quickly than the same operation with the FAL instruc-
tion. Unlike the FAL instruction, there is no control ele- N20:1
ment to monitor or manipulate. Data conversion does not N20:2
take place, so the source and destination should be the N15:5 N20:3
N20:4
same file types. An example of the file COP instruction is N20:5
shown in Figure 10-15. The operation of the program can N20:6
be summarized as follows:
Figure 10-16 Fill file (FLL) instruction.
• Both the source and destination are file addresses.
• When input A goes true, the values in file N40 are • Because the instruction transfers to the end of the
file, the file will be filled with the same data value in
copied to file N20. each word.
• The instruction copies the entire file length for each
scan during which the instruction is true. The FLL instruction is frequently used to zero all of
the data in a file, as illustrated in the program of Fig-
An example of the fill file (FLL) instruction is shown in ure 10-17. The operation of the program can be summa-
Figure 10-16. It operates in a manner similar to the FAL rized as follows:
instruction that performs the word-to-file copy in the ALL • Momentarily pressing pushbutton PB1 copies the
mode. The operation of the program can be summarized contents of file #N10:0 into file #N12:0.
as follows:
• Momentarily pressing pushbutton PB2 then clears
• When input A goes true, the value in N15:5 is cop- file #N12:0.
ied into N20:1 through N20:6. • Note that 0 is entered for the source value.

Data Manipulation Instructions Chapter 10 215

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