Mitsubishi Electric MELSEC FX Series - Page 386

7 Applied Instructions
7.8 External FX I/O Device
384
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Content of display and operation unit
1) Digit specification n of 7-segment display unit with BCD decoder
In the following explanation of operation, four digits (10
3
digits) are supposed.
2) Operation of digit select switch ( +2, +3)
- Operation when carry-down switch +2 is ON
Every time the switch is pressed, the digit specification changes in the sequence of 10
3
→ 10
2
→ 10
1
→
10
0
→ 10
3
.
- When carry-over switch +3 is ON
Every time the switch is pressed, the digit specification changes in the sequence of 10
3
→10
0
→ 10
1
→
10
2
→ 10
3
.
3) Operation of LED for selected digit display ( +4 to +7)
The specified digit is displayed by LED by strobe signals +4 to +7.
4) Operation of data change switch of digit unit ( , +1)
Data changes in the digit specified by the "digit select switch."
- Operation when increment input is ON
Every time the switch is pressed, the content of changes in the sequence of 0 → 1 → 2 → ... → 8
→ 9 → 0 → 1.
- Operation when decrement input is ON
Every time the switch is pressed, the content of changes in the sequence of 0 → 9 → 8 → 7 ... →
1 → 0 → 9.
The content can be displayed in 7-segment display unit.
Thus, by a series of operations, desired numeric values can be written into while observing the 7-
segment display unit.
Display, operation panel
1
2
4
8
10
0
10
1
10
2
10
3
Display for
selected digit
+7
+2
+4
+6
+5
+3
+1
7-segment display unit
7-segment display unit with latch for
visual display of numeric value being set
Arrow switch (arrow-mark switch)
A switch for selecting each digit and increasing
or decreasing the numeric value of selected digit.
Strobe output
+2
+3
+1
To PLC
output
To PLC
output
To PLC
input
Decrement
Increment
Carry over Carry down
+1
+2
+3
s
s
s
s
d2
s
d2
d2
d2
d2
d2
d2
d2
s
s
s
Numeric value output
Switch