I/O Circuitry - Sony LT 100 Gebrauchsanweisung

7-4. I/O circuitry

LZ60-B1, BCD board
42
Input circuit
COM (+) : MAX. 26.4 V, MIN. 4.8 V
V : MAX. COM (+) + 1 V,
IH
MIN. COM (+) – 0.8 V (or open)
V : MAX. 0.5 V, MIN. 0 V
IL
Note
The internal +5 V DC can be used as COM (+) by setting the DIP switches on the BCD
board. In this case, the board can also be operated by switching ON/OFF between the
input and 0 V pins. However, the other side GND and the 0 V pin of the LT100 must be the
same electric potential.
Output circuit
V : MAX. 0.7 V (I = 10 mA)
OL OL
I : MAX. 10 µA (V = 26.4 V)
OH OH
Note
The 0 V pin is for the input circuit. Do not use this pin for the output circuit.
!
Caution
When connecting an L (coil) load such as a relay or lamp to output pins, be sure to connect
a relay with a built-in back-voltage absorption diode, or connect a diode with a back-
voltage about three times the supply voltage in parallel with the coil. Otherwise, the
photocouplers may be damaged.
To counter board output pin
To counter board COM (–)
+5V +5V
Switch
2.1kΩ
Sharp
PC356NT
+5V
Sharp
PC356NT
Vcc
COM(+)
IN
0V
OUT
COM(–)
Relay