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Examples Of Troubles With The I/o Module; Troubleshooting For Input Circuit - Mitsubishi Electric NZ2GN2B1-32D User Manual

Programmable controller cc-link ie tsn remote i/o module.
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11.5

Examples of Troubles with the I/O Module

Troubleshooting for input circuit

This section describes the troubleshooting for input circuit.
An input signal does not turn off No.1
■Cause
Drive by a switch with LED indicator
Leakage current
■Action
Connect an appropriate resistor as shown below so that a current through the input module may become lower than the OFF
current.
Resistor
For the calculation example of a resistor to be connected, refer to the following.
■Calculation example
If the switch with LED indicator with maximum leakage current of 3mA when 24VDC external power supply is provided to the
NZ2GN2B1-32D is connected
Leakage current 3mA
24VDC
1.
The OFF current of NZ2GN2B1-32D is not 1.5mA or lower. Therefore, connect a resistor as shown below.
3mA
I
=1.5mA
R
24VDC
2.
To satisfy the condition that the OFF current of NZ2GN2B1-32D is 1.5mA or lower, the current through the connected
resistor should be 1.5mA or higher. From the formula below, the connected resistor (R) is lower than 3.0kΩ.
I
: I
= Z (Input impedance): R
R
Z
I
Z
R ≤
× Z (Input impedance) =
I
R
3.
When the resistor (R) is 2.5kΩ, for example, the power capacity (W) of the resistor (R) becomes 0.332W.
2
2
W = (Input voltage)
÷ R = 28.8
4.
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 2.5kΩ; and 1 to 2W.
11 TROUBLESHOOTING
11.5 Examples of Troubles with the I/O Module
DC input (sink)
Input
module
DC input (sink)
Input
module
Input module
I
=1.5mA
Z
Input impedance
R
3.0kΩ
1.5
× 3.0 = 3.0[kΩ]
1.5
÷ 2500 = 0.332[W]

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