114
10 TROUBLESHOOTING
10.5 Fault Examples with the Safety Remote I/O Module
2.
The OFF current of NZ2GNSS2-8D is not 1.3mA or lower. Therefore, connect a resistor as shown below.
3.
To satisfy the condition that the OFF current of NZ2GNSS2-8D is 1.3mA or lower, the current through the connected
resistor should be 1.7mA or higher. From the formula below, the connected resistor (R) is lower than or equal to 4.2k
.
4.
When the resistor (R) is 3.6k
, for example, the power capacity (W) of the resistor (R) becomes 0.23W.
5.
Because the resistor requires a power capacity that is 3 to 5 times larger than the actual current consumption, the
resistor connected to the terminal should be 3.6k
; and 0.75 to 1.2W.
A signal incorrectly inputs data
■
Cause
Noise is taken as input data.
■
Action
• To prevent excessive noise, avoid installing power cables together with I/O cables.
• Set a longer input response time. (
• Take noise reduction measures such as connecting surge absorbers to noise-generating devices such as relays and
contactors using the same power supply.
• To prevent noise from being taken in, take measures to reduce noise for the I/O cable by using a part such as a ferrite core.
• To prevent radiation noise, take measures to reduce noise by using a shielded cable.
3.0mA
R
I
z
= 1.3mA
I
R
= 1.7mA
COM-
Xn
Z
Tn
V
ZD
= 3.7V
Input resistance 2.6kΩ
R × I
R
≤ Z (Input resistance) × I
Z
+ V
ZD
R ≤
I
R
Z (Input resistance) × I
Z
+ V
ZD
=
2.6 × 1.3 + 3.7
1.7
= 4.2 [kΩ]
W = (Input voltage)
2
÷ R = 28.8
2
÷ 3600 = 0.23[W]
Summary of Contents for CC-Link IE-NZ2GNSS2-16DTE
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Page 35: ...4 PROCEDURES BEFORE OPERATION 33 4 MEMO ...
Page 162: ...160 APPX Appendix 7 Added and Changed Functions MEMO ...
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