Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル
435
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.5 FNC 74 – SEGL / Seven Segment With Latch
11
FN
C
C
30
-FN
C
C
39
R
otati
on and
on and
Shi
ft
ft
12
FNC4
0-F
0-F
NC4
9
D
ata O
per
ati
per
ati
on
13
FN
C
C
50-FN
C
59
H
igh S
pe
ed
P
rocessing
14
FM
C
C
60-FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
0-F
NC7
9
Ex
ter
nal FX
I/O
D
evice
16
FN
C
C
80-FN
C
89
Ext
ernal
FX
ernal
FX
De
vic
vic
e
17
FN
C
100-
FN
FN
C
10
9
Da
ta
Transf
er 2
er 2
18
FN
C
110-
FN
FN
C
139
Floati
ng Poi
nt
19
FN
C
14
0-F
N
C
149
Da
ta
O
per
at
at
ion 2
20
FN
C
150-
FN
FN
C
159
Posit
ioning
C
ont
ro
ro
l
15.5.1 How to select a seven-segment display unit
When selecting a seven-segment display unit based on its electrical characteristics, refer to the manual below:
→ For the wiring, refer to the Hardware Edition of the used PLC.
1. Points to be checked for the seven-segment specifications
1) Whether the input voltage and current characteristics of the data input and strobe signal satisfy the output
specifications of the PLC.
- Whether the input signal voltage (Lo) is approximately 1.5 V or less
- Whether the input voltage is from 5V DC to 30V DC
- Whether the input voltage is from 5V DC to 30V DC
2) Whether the seven-segment display unit has the BCD decoding and latch functions
15.5.2 How to select parameter "n" based on seven-segment display specifications
The value set to the parameter "n" varies depending on the signal logic of the seven-segment display. Select "n" as
described below.
The check column is provided at the bottom of the table. Check a corresponding type of logic (positive or negative),
and utilize it for parameter setting.
described below.
The check column is provided at the bottom of the table. Check a corresponding type of logic (positive or negative),
and utilize it for parameter setting.
1. Role of the parameter "n"
The parameter "n" should be determined according to the data input logic (positive or negative) of the seven-segment
display unit, the logic (positive or negative) of the strobe signal and the number of sets of 4 digits to be controlled (1 or
2).
display unit, the logic (positive or negative) of the strobe signal and the number of sets of 4 digits to be controlled (1 or
2).
2. Checking the output logic of the PLC
Transistor outputs in PLCs are classified into the sink output type and source output type. The table below shows the
specifications for each type.
specifications for each type.
Logic
Negative logic
Positive logic
Output type
Sink output (
− common)
Source output (+ common)
Output circuit
Description
Because transistor output (sink) is provided, the output
becomes low level (0 V) when the internal logic is "1 (ON
output)". This is called "negative logic."
becomes low level (0 V) when the internal logic is "1 (ON
output)". This is called "negative logic."
Because transistor output (source) is provided, the output
becomes high level (V+) when the internal logic is "1 (ON
output)". This is called "positive logic."
becomes high level (V+) when the internal logic is "1 (ON
output)". This is called "positive logic."
Check
ON
PLC
LOW
Logic 1
Pull-up
resistor
COM1
Y000
ON
PLC
Logic 1
Pull-
down
resistor
V+
HIGH
+V0
Y000