2.
To ensure that the OFF current of the safety remote I/O module is 1.5mA or lower, the current through the connected
resistor should be 0.5mA or more, so that the value of the connected resistor is lower than 12 k.
I
: I
= Z: R
R
Z
I
1.5
Z
R ≤
× Z =
× 4 = 12[kΩ]
I
0.5
R
3.
When the resistor (R) is 5.6 k, the power capacity (W) of the resistor (R) becomes 0.125W.
2
2
÷
÷
W = V
R = 26.4
5600 = 0.125[W]
V: Input voltage
4.
Because the resistor requires the power capacity of 3 to 5 times as large as the actual current consumption, the resistor
connected to the terminal should be 5.6 k, and 0.5 to 0.75W.
5.
OFF voltage when the resistor (R) is connected becomes 4.67V. This satisfies the condition that the OFF voltage of the
safety remote I/O module must be 5V or lower.
1
1
1
+
5.6[kΩ]
4[kΩ]
A signal incorrectly inputs data
■Cause
Noise is taken as input data.
■Action
• Set a long input ON/OFF delay.
Ex.
1ms 5ms
For the setting procedure, refer to the following.
Page 49 Input ON delay, input OFF delay functions
If the above change has no effect, take the following two measures:
• To prevent excessive noise, avoid installing power cables together with I/O cables.
• Connect surge absorbers to noise-generating devices such as relays and conductors using the same power supply or take
other noise reduction measures.
10 TROUBLESHOOTING
92
10.6 Fault Examples with the Safety Remote I/O Module
× 2[mA] = 4.67[V]