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MELSEC-A
6 TROUBLESHOOTING
6.2 Examples of Errors for CC-Link Embedded I/O Adapter
This section explains examples of errors that occur in the input circuit, and the
appropriate corrective actions.
6.2.1 Errors occurring in the input circuit and corrective actions
Examples of errors that occur in the input circuit and corrective actions are explained
below:
Error status
Cause
Corrective action
Example 1 Input signals do not turn off.
•
Activation via the LED display switch.
Leakage current
CC-Link
embedded
Input
adapter
DC input (sink)
•
Connect a resistor so that the voltage
between the input terminal and COM1
becomes lower than the OFF voltage.
Resistor
CC-Link
embedded
Input
adapter
DC input (sink)
A calculation example used to obtain the
resistance value to be connected is shown
on the following page.
Example 2 Input signals do not turn off.
•
Sneak path due to the use of two power
supplies.
DC input
CC-Link
embedded
Input
adapter
E1
E2
E1 > E2
•
Reduce the number of power supplies
from two to one.
•
Connect a diode to prevent sneak path.
(as below)
E1
E2
DC input
CC-Link
embedded
Input
adapter
Summary of Contents for CC-Link
Page 1: ...CC Link Embedded I O Adapter User s Manual ...
Page 2: ......
Page 13: ...1 5 1 5 MELSEC A 1 OVERVIEW MEMO ...
Page 17: ...3 2 3 2 MELSEC A 3 SPECIFICATIONS MEMO 3 ...
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