Mitsubishi Electric MELSEC-L Series - End Codes Returned to a Connected Device During Data Communications

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16.7.1 End codes returned to a connected device during data
communications
The following table lists the error codes stored in the end code appended to a response during data communications.
: Stored in the end code appended to a response
Error
code
Error description Action
Data communication type
MC protocol
communications
Communications
using a fixed
buffer
Communications
using a random
access buffer
00
H
• Normal completion
When each
communication is
normally completed, the
error code 00
H
is stored.
 
02
H
• The device range destination of
devices to be read/written from/to is
incorrect.
• Check and correct the
specified start device
and the number of
points.

50
H
• Codes for the command/response
type of a subheader are not within the
specifications.
MC protocol communications: 00
H
to
3C
H
Communications using a fixed buffer:
60
H
Communications using a random access
buffer: 61
H
, 62
H
• In communications using a fixed
buffer, if the data length setting is
smaller than the actual data amount,
the remaining data is processed as the
second data. In this case, a subheader
undefined command type error may
occur.
• Check and correct the
command/response
type set for the
connected device.
(Because the E71
automatically adds
the
command/response
type, the user setting
is not required.)
• Check and correct the
data length.
 
51
H
• In communications using a random
access buffer, the start address
specified by a connected device has
been set outside the range from 0 to
6143.
• Check and correct the
specified start
address.

52
H
• In communications using a random
access buffer, the start address and
the number of data words (depending
on the setting when reading data)
specified by a connected device
exceeds the range from 0 to 6143.
• Data by the number of words specified
(text) cannot be sent in one frame.
(The data length value or the amount
of the text sent/received are not in the
allowable range.)
• Check and correct the
start address and the
number of data
words.
• Correct the number of
read/write points.
