Mitsubishi Electric MELSEC iQ-R Series User Manual page 94

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]