Examples Of Errors For Cc-Link Embedded I/O Adapter; Errors Occurring In The Input Circuit And Corrective Actions - Mitsubishi Electric CC-Link User Manual

6 TROUBLESHOOTING

6.2 Examples of Errors for CC-Link Embedded I/O Adapter

6.2.1 Errors occurring in the input circuit and corrective actions

Error status
Example 1 Input signals do not turn off.
Example 2 Input signals do not turn off.
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This section explains examples of errors that occur in the input circuit, and the
appropriate corrective actions.
Examples of errors that occur in the input circuit and corrective actions are explained
below:
• Activation via the LED display switch.
• Sneak path due to the use of two power
supplies.
E1
E1 > E2
Cause
DC input (sink)
CC-Link
Leakage current embedded
Input
adapter
DC input
CC-Link
embedded
E2
Input
adapter
MELSEC-A
Corrective action
• Connect a resistor so that the voltage
between the input terminal and COM1
becomes lower than the OFF voltage.
Resistor
A calculation example used to obtain the
resistance value to be connected is shown
on the following page.
• Reduce the number of power supplies
from two to one.
• Connect a diode to prevent sneak path.
(as below)
E2
E1
DC input (sink)
CC-Link
embedded
Input
adapter
DC input
CC-Link
embedded
Input
adapter
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