Mitsubishi Electric NZ2GF2B1-16D User Manual page 253

5.
OFF voltage when the resistor (R) is connected becomes 5.77V. This satisfies that the OFF voltage
of the input module is 8V or lower.
(2) An input signal does not turn off No.2
Cause
By using two power supplies, a sneak path is configured.
E1 E2
E1 E2
(3) A signal incorrectly inputs data
Cause
Noise is taken as input data.
1
3[mA] = 5.77[V]
1 1
+
3.9[k ] 3.8[k ]
• Use one power supply.
• To prevent the sneak path, connect a diode as shown below.
DC input
Input
module
E1
• 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.
CHAPTER 12 TROUBLESHOOTING
Action
DC input
Input
module
E2
Action
12
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