285
CHAPTER 15 TROUBLESHOOTING
15
15.3 Checking for Functional Errors
15.3 Checking for Functional Errors
If the module has a functional problem, check the following items and perform troubleshooting. If the ERR. LED is on
or flickering, remove the error cause by the programming tool. ( Page 282, Section 15.2)
Function Error status Reference
Write to PLC
Data cannot be written to the CPU module.
Page 286, Section 15.3.1 (1)
The program is rewritten unintentionally.
Page 286, Section 15.3.1 (2)
Read from PLC Data cannot be read from the CPU module.
Page 286, Section 15.3.1 (3)
Boot operation
A boot operation cannot be performed from
a memory card or SD memory card.
Page 287, Section 15.3.2
Error caused by hardware
UNIT VERIFY ERR. has occurred.
Page 288, Section 15.3.3 (1)
CONTROL BUS ERR. has occurred.
Page 288, Section 15.3.3 (2)
Ethernet communication
Direct connection is not possible.
Page 289, Section 15.3.4 (1)
Ethernet communication is not possible
when using a method other than direct
connection.
Page 290, Section 15.3.4 (2)
Ethernet communication is not possible with
the connected device.
Page 290, Section 15.3.4 (3)
Clock data cannot be set by SNTP.
Page 292, Section 15.3.4 (4)
Socket communication function
The connected device cannot receive data.
Page 294, Section 15.3.5 (1)
Data cannot be received.
Page 294, Section 15.3.5 (2)
The open processing is not completed.
Page 294, Section 15.3.5 (3)
MC protocol function
An error has occurred during MC protocol
communication.
Page 295, Section 15.3.6
Errors caused by SFC program instruction
"OPERATION ERROR" has occurred at
execution of the S(P).SFCSCOMR and
S(P).SFCTCOMR instructions.
Page 298, Section 15.3.10 (1)
Comments cannot be read at execution of
the S(P).SFCSCOMR and
S(P).SFCTCOMR instructions.
Page 298, Section 15.3.10 (2)
I/O module
The LEDs of the output module do not turn
on.
Page 299, Section 15.3.11 (1)
I/O module does not operate normally.
Page 299, Section 15.3.11 (2)
Wiring troubles
Building Block I/O Module User's
Manual
Power supply module
The LIFE OUT
terminal has turned off
(opened).
Page 300, Section 15.3.12 (1)
The ERR.
terminal has turned off (opened).
Page 300, Section 15.3.12 (2)
CC-Link IE Field Network Basic function
An error has occurred while the CC-Link IE
Field Network Basic function was being
used.
CC-Link IE Field Network Basic
Reference Manual
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