424
FX
3U
/FX
3UC
Series Programmable Controllers
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)
2. Timing chart
Types of output signals
•
to
+7: Sending output (
handles low-order bits, and
+7 handles high-order bits.)
•
+8:
Strobe signal
•
+9:
Execution flag which operates as shown in the above timing chart
Extension function
1. 16-byte serial output
Depending on the ON/OFF status of the special auxiliary relay M8027, the number of characters output by
one-time execution of the instruction varies.
While M8027 is OFF, 8-byte serial output (fixed to 8 characters) is executed. While M8027 is ON, 16-byte
serial output (1 to 16 characters) is executed.
In the example shown below, up to 16 characters (1 character/byte) are output to the display unit (external
display unit A6FD, for example).
It is supposed that data to be displayed is stored in hexadecimal codes in D300 to D307.
1) Connection example of the external display unit A6FD
*1
The PLC shown in the example below is the FX
2N
-16EYT (sink input/sink output) connected to the
FX
3U
-32M
.
*1.
A6FD was distributed only inside Japan, however, production of the external display unit A6FD was
terminated in November 2002.
T
0
T
0
T
0
T
0
: Scan time (ms)
A
B
C
D
H
Command input
to +7 Data
+8 Strobe
+9 Execution flag
+1
+2
+3
+7
D
D
D
D
S
1
S
1
S
1
S
1
S
1
D
D
D
D
D
D
External display unit A6FD
*1
PLC
AC100/200V
LG
Y031 Y032
24V
D 0
D 1
D 2
D 3 D 4
D 5
D 6
D 7
Y033
COM1
Y020 Y021 Y022 Y023 Y024 Y025 Y026 Y027 COM2 Y030
STR
COM
12V
AC
AC
NC
∼
Содержание FX3U Series
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