Mitsubishi Electric MELSEC FX3U Programming Manual page 467

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. Timing chart
Command input
D D
to +7 Data
D
+8 Strobe
D
+9 Execution flag
Types of output signals
• to
D D
• +8:
D
• +9:
D
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
The PLC shown in the example below is the FX
FX -32M .
3U
COM1 Y020 Y021 Y022 Y023 Y024 Y025 Y026 Y027 COM2 Y030
12V
24V
COM D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7
External display unit A6FD
*1. A6FD was distributed only inside Japan, however, production of the external display unit A6FD was
terminated in November 2002.
S S
+1
1 1
A B
T T
0 0
T
0
+7: Sending output (
D
Strobe signal
Execution flag which operates as shown in the above timing chart
*1
15 External FX I/O Device – FNC 70 to FNC 79
S S
+2 +3
1 1
C D
T : Scan time (ms)
0
handles low-order bits, and
*1
-16EYT (sink input/sink output) connected to the
2N
PLC
Y031 Y032
NC
STR
15.8 FNC 77 – PR / Print (ASCII Code)
S
+7
1
H
+7 handles high-order bits.)
D
Y033
AC100/200V
∼
AC AC
LG
11
12
13
14
15
16
17
18
19
20
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