11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
83
11
■
Calculation example
If the switch with LED indicator with maximum leakage current of 3mA when 24VDC is supplied to the NZ2MFB1-32D is
connected
1.
The OFF current of NZ2MFB1-32D is not 1.7mA or lower. Therefore, connect a resistor as shown below.
Z: Input impedance
2.
To satisfy the condition that the OFF current of NZ2MFB1-32D is 1.7mA or lower, the current through the connected
resistor should be 1.3mA or higher. From the formula below, the connected resistor (R) is lower than 4.97k
.
3.
When the resistor (R) is 3.9k
, for example, the power capacity (W) of the resistor (R) becomes 0.179W.
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 3.9k
; and 1 to 2W.
5.
OFF voltage when the resistor (R) is connected becomes 5.77V. This satisfies that the OFF voltage of NZ2MFB1-32D is
8V or lower.
Input module
Leakage current 3mA
24VDC
Z = 3.8k
Ω
I
R
= 1.3mA
3mA
Iz = 1.7mA
24VDC
Resistor
R
≤
I
R
I
Z
1.3
1.7
× Z =
× 3.8 = 4.97[k
Ω
]
W = V
2
R = 26.4
2
÷
3900 = 0.179[W]
÷
× 3[mA] = 5.77[V]
3.9[k
Ω
]
1
3.8[k
Ω
]
1
+
1
Summary of Contents for NZ2MFB1-32D
Page 2: ......
Page 14: ...12 1 PRODUCT LINEUP 1 3 I O Combined Module MEMO ...
Page 16: ...14 2 PART NAMES MEMO ...
Page 43: ...4 PROCEDURES BEFORE OPERATION 41 4 MEMO ...
Page 45: ...5 SYSTEM CONFIGURATION 43 5 MEMO ...
Page 76: ...74 9 PROGRAMMING 9 2 Program Example Program example ...
Page 78: ...76 10 MAINTENANCE AND INSPECTION MEMO ...
Page 119: ...APPX Appendix 8 External Dimensions 117 A MEMO ...
Page 121: ...I 119 MEMO ...
Page 125: ......