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Mitsubishi Electronics FX3G User Manual

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FX
3S
/FX
3G
/FX
3GC
/FX
3U
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3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.8 FNC 77 – PR / Print (ASCII Code)
11
FN
C30
-FN
C3
9
R
ota
tion and 
Shi
ft
12
FN
C40-FN
C49
D
ata O
perati
on
13
FNC
50-FNC
59
High-Speed
 
Proc
essing
14
FM
C60-FN
C69
H
andy 
In
struction
15
FN
C70-FN
C79
E
xternal
 F
X
 I/O
 
De
vice
16
FNC
80-FNC
89
External
 FX 
Dev
ice
17
FNC1
00-
FNC10
9
Dat
a 
Transfer 2
18
FNC1
10-
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
 
Operation 2
20
FNC1
50-
FNC159
Pos
itioning 
Control
Cautions
1. Command input and instruction operation
While the command input is ON:
Even if the command input is continuously ON, execution is completed after a
series of outputs.
M8029 turns ON when the command input turns OFF after M8027 turns ON and
execution is completed.
While the command input is OFF:
All outputs are OFF.
2. Relationship with the scan time (operation cycle)
This instruction is executed in synchronization with the scan time.
If the scan time is short, the constant scan mode can be used. If the scan mode is too long, the timer interrupt function
can be used.
3. Output type of the PLC
Use a transistor output type PLC.
4. When "00H (NULL code)" is contained in the data (while M8027 is ON)
The instruction is executed completely, and the data after "00H" is not output.
M8029 remains ON during one operation cycle.
5. Limitation in number of instructions
The PR instruction can only be executed twice in a program.
If it is necessary to use the PR instruction 3 times or more, use the indexing (V, Z) function in programming.
6. Caution on use in timer interrupt programs
When the PR instruction is used in a timer interrupt program, it turns ON M8029 in the interrupt program.
→ For details, refer to Subsection 36.5.2.