Overview Of External Contact Point Input - Sony LY51 Instruction Manual

4-4-1.

Overview of External Contact Point Input

Input circuit of external input signal
•
When you use the external input, connect the external input terminal to GND (common terminal) for at least 25 ms. When you
input the external input signal again, provide an OFF time of at least 30 ms.
•
We recommend that you use SN75451 or SN75452 as electronic switches.
•
Use a shielded connection cable and connect the shielding to the shell of the I/O connector. Connect the common cable
separately from the shielded cable. (Please procure the switch and shielded cable.)
Note When using this contact point input as an external zero point, you can only use contact point switches or other ON/OFF
signals. You cannot use Sony Precision Technology Magne-switches.
•
Input circuit
<During +24 V, +12 V or other external power supply
operation>
(Note: +5 V operation is also possible.)
To internal
circuit
470
+
118
Apply + 24V
(or + 12V)
Vcc
Pin 8
1 kΩ
Input signal
Input signal
Pin 2, 6, 11
Switching
4.7 µF/50V
circuit
GND
G2
1
Pin 1
Connect circuit example
<During internal +5 V operation>
+5V
Power
supply
+5V
Pin 9
Vcc
Pin 8 Connect circuit example
1kΩ
470
Input signal
Input signal
+
Pin 2, 6, 11
4.7µF/50V Switching circuit
G2
Pin 1 1
0V
0V
0V
Pin 20