IDEC DD3S Series, Руководство пользователя

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26
DD48
Series
Display Units
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
A
B
C
D
Binary-
coded
Input
Latch Input
Display Character
Maintains
display
Maintains
display
“1” “2” “3” “4” “5” “6” “7” “8” “9”
“1” “2” “5” “6” “8” “9”
T1 T2 T3
(H)
(L)
Data Input
Latch Input
Maintain Maintain
Data is
read.
T1 ≥ 0 ms
T2 ≥ 1 ms
T3 ≥ 1 ms
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
4th
Digit
4th
Digit
3rd
Digit
2nd
Digit
1st
Digit
3rd
Digit
2nd
Digit
1st
Digit
Display
(Example)
4th Digit
Data
Binary-coded
Input
(Data Input)
Latch
Input
Display Unit
Maintain Maintain
Maintain Maintain
Maintain Maintain
Maintain Maintain
3rd Digit
Data
2nd Digit
Data
1st Digit
Data
“4” “7” “5” “2”
4th
Digit
Binary-coded Input
(Data Input) (Latch Input)
3rd
Digit
2nd
Digit
1st
Digit
Latch Latch Latch Latch
3rd 2nd
4th 1st
Block Diagram
Latch Input
Latch Operation
Latch Input Timing Chart
Note 1: The above chart represents positive logic units. Negative logic units
have characteristics with (H) and (L) reversed.
Note 2: The rise and fall times of input pulses should be made as short as
possible. (0.1 ms maximum)
Note 3: If the data input is changed in the period of T2, the display will
change.
Application of Latch Function
Note: The following chart represents positive logic digital display units.
Negative logic units have characteristics with (H) and (L) reversed.
Instructions
1. When cleaning the surface of the filter and housing, use a soft
cloth. Do not use thinner or acid to clean the surface.
2. When the display unit is mounted in a panel cut-out, do not
place a metal object or power line within 40 mm from the end
of the connecter terminals (or PC board terminals) at the rear
of the display unit.
3. If the display units are subjected to voltage surges, install a
surge suppressor in the power line.
4. Use a shielded cable or metal conduit for the input line. Run
the input wiring as far away as possible from high-voltage and
motor lines. Make the input line as short as possible.
5. When using display units in environments where a large
amount of electrostatic noise is generated, such as where
molding materials, powders, or fluids are transferred through
pipe lines, keep the display units as far away as possible from
electrostatic sources.
6. Avoid using the display unit in a place where excessive and
frequent vibration or impact may occur.
7. Avoid using the display unit in a place where it is exposed to
corrosive gas, water or oil splashes, dust or direct sunlight, or
in a place where organic solvents are used.
8. The filter is made of acrylic.
9. If the Latch input is on when the DD48 is powered up, the
data input cannot be read correctly or wrong data may be
maintained. Do not turn on the Latch input until at last 0.5 sec
after the DD48 is powered up.
10. When the DD48-F01 is powered up, an inrush current of 0.5A
(10 ms maximum) and when the DD48-F31 is powered up,
an inrush current of 0.5A (10 ms maximum) flows through the
internal power supply circuit. Select an external power supply
of sufficient capacity, taking inrush current into consideration.
11. When connecting a pull-up or pull-down resistor to the input
terminals, ensure compatibility with the input resistor in the
DD48 internal circuit.