Example: Connection Of Dc 2-Wire Sensor - Panasonic S-LINK V User Manual

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 : SL-VT8J ON voltage = 17V or more (between +24V and data input)
THON
: SL-VT8J OFF voltage = 4V or less (between +24V and data input)
V
THOFF
R : Input impedance of SL-VT8J = 3.3kΩ
1
V (residual voltage in ON mode) of GX-12MU = 3V or less
A
Specified operation voltage range of GX-12MU = 12 to 24V DC
Minimum load current of GX-12MU = 3mA
A (leakage current) of GX-12MU = 0.8mA
1
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 of DC 2-wire input device
A
R
1
Check 3
V 4V
THOFF
= ≈
R
3.3kΩ
1
Since the requirements of Checks 2 and 3 are satisfied, the bleeder resistor is not necessary.
Connection of DC 2-Wire Output Device to Input Unit
21.6V-3V
≈
=
3.3kΩ
1.21mA ≥ 0.8mA
V
TH
R : Input impedance
1
S-LINK V input unit
% = 10.2 to 26.4V DC
+10
– 5
18.6V
5.64mA ≥ 3mA
≈
3.3kΩ
+24V
R : Bleeder resistance
B
Input
Output
DC 2-wire
input device
0V
0V
Input device
27