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Using the LED Indicators and Display for Troubleshooting Section 14-2
Errors Related to Memory
Access
The 7-segment display alternates between the node address and error code.
Indicator Error Cause Unit operation (Flag
status)
Error
log
(hex)
Countermeasure
MS NS 7-segment
Flashing
red
--- E9 Memory
Access Error
An error
occurred in the
Unit's non-vola-
tile memory
itself. This error
will occur in the
following cases.
1. An error oc-
curred while
writing the er-
ror log.
2. An error oc-
curred while
writing the
device pa-
rameters.
Note:
This error does
not indicate
checksum errors
detected when
reading data.
Case 1:
The error record
remains in RAM only.
Subsequent writes to
non-volatile memory
are all ignored. Other
than that, normal
operation continues.
(Error records con-
tinue to be written to
RAM.)
Case 2:
Tag data links and
message communica-
tions will continue
operating.
The Unit Error
Occurred Flag (n+10,
bit 00), Unit Memory
Error Flag (n+10, bit
04), and Non-volatile
Memory Error Flag
(n+14, bit 15) will turn
ON.
0602 Download the Unit
Setup from the tab
pages of the Edit
Parameters Dialog
Box of the CX-Pro-
grammer and
download the
device parameters
from the Network
Configurator. If the
error recurs,
replace the Ether-
Net/IP Unit or (for a
built-in EtherNet/IP
port) the CPU Unit.