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FX2NC Series Programmable Controllers Inputs 5.
5-7
5.1.4 Resistors and inputs connected in parallel;
Parallel resistance Rp: FX
2NC
= 15k
Ω
. If resistance Rp is less than the stated value, then add
Rb. See equation 1 for Rb calculation.
Alternatively; Current leakage: FX
2NC
= 1.5mA. If the current leakage is greater than the stated
value, then add Rb. See equation 2 for Rb calculation.
Figure 5.5 : Parallel LED
Rb
≤
4
Rp
15 -
Rp
Eqn 1 :
Rb
≤
6
Ι
- 1.5
Eqn 2 :
FX
2NC
Main unit
FX
2NC
Extention
block
X
COM
+24V
Rb
Rp
LED