Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 480

478
27 TROUBLESHOOTING
27.4 Error Code List
7D17H Packet size error • A packet of more than
2048 bytes was received.
CHn
ERR.
• Check the data length of the
packet sent from the target
device.
• Divide the packet data into
several parts and send them
separately.

7D18H Insufficient digit
number error
• When data is received
using a protocol including
a packet that contains
Conversion variable
(Variable number of data),
the data (the number of
digits) corresponding to
the Conversion Variable is
insufficient.
CHn
ERR.
• Review data sent from the
target device.
• Check the packet format of
the target device to see if the
number of digits is set
correctly.

7D19H Abnormal digit
number error
• When data is received
using a protocol including
a packet that contains
Conversion Variable
(Fixed number of data and
variable number of digits),
the corresponding data is
0 bytes (0 digits) or
exceeds the maximum
number of digits.
CHn
ERR.
• Review data sent from the
target device.
• Check the packet format of
the target device to see if the
number of digits is set
correctly.

7D1AH Data length error • In the data received from
the target device, the
Length value does not
match the data length of
the Conversion
Variable(s).
CHn
ERR.
• Check the packet format of
the target device to see if the
conversion variable is set
correctly.
■Check the data sent from the
target device to see if;
• The Length value is incorrect.
• Any of the data corresponding
to the conversion variable is
missing.

7D1BH Value range error • When data is received
using a protocol including
a packet that contains
Conversion Variable, data
for the Conversion
Variable exceeds the
range of value allowed for
C24.
CHn
ERR.
• Review data sent from the
target device.
■Check the packet format of the
target device to see if the
conversion size is set incorrectly.
• If it exceeds the range for
word data, change the
conversion size setting to
double word.
• If it exceeds the range for
double word data, change the
element to Non-conversion
Variable.

7D20H Data length size
error
Data count size
error
• The value set in the data
length storage area or the
data count storage area is
out of range.
CHn
ERR.
• Check the maximum data
length can be set to the data
length storage area, and
specify the value which is
equal to the maximum data
length or less.
• Check the maximum number
of data can be set to the data
count storage area, and
specify the value which is
equal to the maximum number
of data or less.

Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined