7-2 1. Error Message
Solution
1. Confirm link unit settings.
(After making settings, cut power to the PLC.)
2. Go to the editor (V-SFT) and confirm the settings in the [Comm. Parameter] dialog in the [System
Setting] menu.
3. If errors only occur from time to time, it is possible that there is a noise-based communication error.
* If you still cannot solve the error even after following the suggestions above, contact your local
distributor.
Error Messages for Network Communication
• Ethernet
• MELSECNET/10
Error Message Contents Solution
Error code received The PLC sent an error code (NAK).
Examine the CPU error code and solve the
problem.
Break
The PLC’s SD (TXD) remains at the low
level.
Examine the connection between the PLC’s
SD (TXD) and the V series RD (RXD).
Invalid memory
(applicable to MITSUBISHI CPU)
You specified an address that exceeds the
memory range of the PLC that you are
linked to.
Check the type and range of memory that
you set.
Invalid CPU model
(applicable to MITSUBISHI CPU)
The PLC currently being supported does
not have a corresponding CPU.
Confirm whether or not the CPU that you
are using can be used with the V series.
Format The code of the received data is invalid. Check 1, 2, 3 described below.
Compare
(applicable to HIDIC S10)
Transmission data and received data are
different.
Check 1, 2, 3 described below.
NAK
(applicable to Allen-Bradley PLC)
A NAK code is received. Check 1, 2, 3 described below.
TNS discrepant
(applicable to Allen-Bradley PLC)
Transmitted TNS data and received TNS
data are not in agreement.
Check 1, 2, 3 described below.
Communication Error
An unclear communication error is
detected.
Check 1, 2, 3 described below.
Count error
(applicable to MITSUBISHI CPU
and Q link unit)
The expected data amount is different
from the count value.
Check 1, 2, 3 described below.
Command error
(applicable to MITSUBISHI CPU
and Q link unit)
The response code differs from the
expected code.
Check 1, 2, 3 described below.
Invalid cassette
(applicable to MITSUBISHI ACPU)
This cassette is not included in the
memory cassettes currently being
supported.
Contact your local distributor.
Password error
(applicable to MITSUBISHI QCPU)
The password is incorrect. Contact your local distributor.
Error Message Contents Solution
Ethernet Error: XXXX
The Ethernet status is saved at system
memory address $s518 and a code other than
“0” (normal) is received.
XXXX: Error No.
For the contents and solution to each error
number, refer to Appendix 5 of the PLC
Connection Manual separately provided.
Error Message Contents Solution
I/F Board Err The I/F unit for NET/10 has an error.
Contact your local distributor.Request Code Err
The request command from NET/10 has an
error.
Request Data Err The request data from NET/10 has an error.
Word Writing to Sp. Relay
(MITSUBISHI: A Series)
Word writing to a special relay (M9000 and
later) is attempted.
(Notes: Only bit writing is possible for special
relays when connecting with NET/10.)
Do not attempt to perform word writing to
special relays.
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