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7-2 1. Error Messages
Solution
1. Confirm link unit settings. (After making settings, cut power to the PLC.)
2. Go to the editor 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
Error Message Contents Solution
Error code received The PLC sent an error code (NAK).
Examine the PLC 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 UG 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 UG 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 User's
Manual <Function> (FEH376) separately
provided.