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8. TROUBLESHOOTING
8
−
10
MELSEC-A
(3)
In case the error-detected station number (lower byte of the error information) is any
value other than FF
H
and FE
H
:
Error
Code
Error
Detected
Details
Remedy
01
H
DN91
A fault has been detected with the network after
communication being started.
•
Check if cables are properly connected.
1E
H
DN91
The slave station did not respond.
•
Inspect the state of the network and slave stations
closely: Are MAC IDs and baud rate properly set?
Any faulty slave stations? Any missing terminal
resistance? etc.
20
H
Slave
station
The slave station responded with an error that is
not defined.
•
Read the communication error information, and take
remedial actions thereupon.
23
H
Slave
station
The slave station responded with an error when
establishing a connection.
•
Read the communication error information, and take
remedial actions thereupon.
24
H
DN91
Input data size of the parameters differs from the
size of the actual slave station
•
Refer to the operation manual of the slave station,
and set a proper input data size.
25
H
DN91
Output data size of the parameters differs from the
size of the actual slave station.
•
Refer to the operation manual of the slave station,
and set a proper output data size.
26
H
DN91
Received response data for the function that is not
supported by DN91.
•
Refer to the operation manual of the slave station,
and avoid sending from the slave station any function
that is not supported by DN91.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
27
H
Slave
station
The connection is already in the designated mode.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
28
H
DN91
Unexpected illegal data has been received when
establishing a connection.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
29
H
Slave
station
Connection is already established with the slave
station.
•
Wait and observe for a while, and if the connection is
not established, reset the slave station.
2A
H
DN91
Polling response data length differs from the
length of data that has been read from the slave
station when establishing a connection.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
2B
H
DN91
The first division data has been received twice
during divided receipt of polling response.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
2C
H
DN91
Division data number that has been received is
not what is expected during divided receipt of
polling response.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
2D
H
DN91
Intermediate or the last data has been received
before receiving the first division data during
divided receipt of polling response.
•
Inspect the state of the network and slave stations
closely as for any missing terminal resistance.
3B
H
DN91
Two or more station numbers of the same MAC ID
have been detected in the parameters.
•
The parameters contain two or more slave stations
having the same station number. Correct the station
numbers.
•
The parameters contain slave station(s) of the same
station number as the host station number.
45
H
DN91
O-address in the parameters exceeds 255.
•
Set the O-address at 255 or less.
46
H
DN91
I-address in the parameters exceeds 255.
•
Set the I-address at 255 or less.
47
H
DN91
Illegal connection type is designated.
•
Check if the connection type value is correct.
49
H
DN91
The value of the expected packet rate is less than
that of the production inhibit time.
•
Set the expected packet rate value greater than that
of the production inhibit time.