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MELSEC-
A
10 TROUBLESHOOTING
(2) When calculating the terminator R value, connect a resistor R so that 1.3mA
or more flows to the connected resistor in order to satisfy the R2 OFF
current 1.7mA.
Therefore, a value for the resistor R can be calculated by the following
formulas.
I
R : IZ = z (input impedance) : R (Resistance)
R
≤
IZ
IR
×
z =
1.7
1.3
×
3.3 = 4.3 (k
Ω
)
R
<
4.3k
Ω
When the resistance R is 3.9k
Ω
, power consumption W of the resistor R can
be calculated by the following formula.
W = (input voltage)
2
÷
R = 28.8
2
(V)
÷
3.9k(
Ω
) = 0.2 (W)
(3) The resistor power capacity is selected to be three to fives times the actual
power consumption, so connect a 3.9(k
Ω
)1.0(W) resistor to the problem
terminal.