10 TROUBLESHOOTING
10.5 Fault Examples with the Safety Remote I/O Module
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10.5
Fault Examples with the Safety Remote I/O Module
Troubleshooting for input circuit
This section describes the troubleshooting for input circuit.
An input signal does not turn off.
■
Cause
Drive by a switch with LED indicator
■
Action
Connect an appropriate resistor as shown below so that a current through the input module may become lower than the OFF
current.
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
NZ2GNSS2-8D is connected
1.
Check the following items with the module specifications.
• OFF voltage/OFF current: 5VDC or lower/1.3mA or lower
• Input resistance: Approx. 2.6k
DC input
Input
module
Leakage current
Tn
Xn
COM-
DC input
Input
module
Resistor
Input module
Leakage current 3mA
I (Leakage current) = I
Z
(Off current of the NZ2GNSS2-8D) + I
R
(Current flowing to connected resistor)
I
R
= I - I
Z
= 3.0 - 1.3 = 1.7 [mA]
Содержание CC-Link IE-NZ2GNSS2-16DTE
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