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7.
TRUOBLESHOOTING
MELSEC-A
7 .
TROUBLESHOOTING
7.1
List of Error Codes
(1) Error codes used with an
A64RDC
If an error occurs when data is written
to an A64RDC (when the RUN
LED flashes), any of the error codes shown in the following table will be
stored in the buffer at address 18.
If
an A2CCPU is used, the same
error code is also
stored in special
registers D9180 (remote terminal module No.1) to D9193 (remote ter-
minal module N0.14). If an AJ71PT32-S3 is used, the same error code
is also stored in the buffer at addresses 196 (remote terminal module
No.1) to 209 (remote terminal module N0.14).
Table 7.1 List
of
A64RDC Error Codes
Cause
I
Corrective
Action
(Read error)
Designated head address is
outside the buffer area.
Designated range of read
I
Specify a correct buffer area.
word;
includes addresses
outside the buffer area.
(Write error)
Desianated head address is
outsGe the buffer area.
*
Designated range of write
words includes addresses
outside the buffer area.
Specify a correct buffer area.
Correct the read-only area
specification.
Write was attempted
to
read-
only areas.
Command code other than read
(01 H) or write (02H) is received.
Read/write word length
"0" is
received.
instruction is used.
T~~ retransmission,
Data is received when a FROM
Apply noise-prevention
measures.
The number of words set by
the write command data differs
from that of the received data.
The averaging time is set
outside the 160 to 32000 msec
range.
Reset the averaging time inside
[ ] indicates the channel where
the 160 to 32000 msec range.
the error occurred.
I
Averaging count is set outside
the range of 1 to
800
times.
Reset the averaging count
the error occurred.
times,
[ ] indicates the channel where
inside the range of 1 to 800
(a) If errors occur over a period of time, only the first error code will be
stored.
(b) Error code resetting is done by writing
"0"
to address
18
of the buffer.
(Figures other than
0
are ignored.)
7 - 1
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