27
Chapter 1
Connection of DC 2-Wire Output Device to Input Unit
Example: Connection of DC 2-wire sensor
●
To connect DC 2-wire proximity sensor GX-12MU to 8-channel connector input unit SL-VT8J
V
THON
:
SL-VT8J
ON voltage = 17V or more (b24V and data input)
V
THOFF
:
SL-VT8J
OFF voltage = 4V or less (b24V and data input)
R
1
: Input impedance of
SL-VT8J
= 3.3kΩ
V
A
(residual voltage in ON mode) of
GX-12MU
= 3V or less
Specified operation voltage range of
GX-12MU
= 12 to 24V DC
+10
– 5
% = 10.2 to 26.4V DC
Minimum load current of
GX-12MU
= 3mA
A
1
(leakage current) of
GX-12MU
= 0.8mA
Check 1
21.6V - 17V = 4.6V ≥ 3V
21.6V - 4V = 17.6V (in range of 10.2 to 26.4V)
Since the requirements of both formulas are satisfied, carry out checks 2 and 3.
Check 2
21.6V - V
A
of DC 2-wire input device
R
1
21.6V
-
3V
3.3kΩ
3.3kΩ
18.6V
≈
≈
=
5.64mA
≥ 3mA
Check 3
3.3kΩ
4V
R
1
V
THOFF
≈
=
1.21mA
≥ 0.8mA
Since the requirements of Checks 2 and 3 are satisfied, the bleeder resistor is not necessary.
Main circuit
+24V
Input
Output
Input device
0V
0V
V
TH
R
1
: Input impedance
S-LINK V
input unit
R
B
: Bleeder resistance
DC 2-wire
input device
Содержание S-LINK V
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Страница 5: ...5 Before Using This System ...
Страница 12: ...12 Before Using This System MEMO ...
Страница 13: ...13 Chapter 1 Designing System ...
Страница 35: ...35 Chapter 2 Wiring ...
Страница 60: ...60 Chapter 2 MEMO ...
Страница 61: ...61 Chapter 3 Starting System ...
Страница 71: ...71 Chapter 4 Specifications ...
Страница 161: ...161 Chapter 5 Troubleshooting ...
Страница 169: ...169 Appendix ...
Страница 180: ...180 Appendix MEMO ...