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MELSEC-Q
3 SPECIFICATIONS
Table 3.29 Contents of communication test result
Error code Contents Detailed contents Handling method
0001
H
Node number
duplicate error
There is another node in the
network which has the same
node number as the local
node.
• Assign different node numbers to all nodes in
the network.
0002
H
Bus off error
A bus off occurred during the
test.
• Set the communication speed of all nodes in
the network to the same value.
• Check the overall network conditions, including
if the terminal resistor is disconnected, if the
length of the communication cable is correct,
etc.
0003
H
Network power
supply error
The network power supply is
turned OFF.
• Turn ON the network power supply.
0004
H
0005
H
Communication
error
The data could not be sent or
received correctly.
• Connect one or more nodes in the network.
• Set the communication speed of all nodes in
the network to the same value.
• Check the overall network conditions including if
the terminal resistor is disconnected, if the
length of the communication cable is correct,
etc.
0006
H
No error
Communication test was
completed normally.
—
(27) Parameter save area selection bit (address 0630H/1584)
This bit selects which parameter is to be saved when the save parameter to flash
ROM request (Y17) is turned ON from OFF.
To clear the parameters of the flash ROM, set 8000
H
.
In this case, the parameters of the buffer memory are not cleared.
The default value varies depending on the operating mode. See Table 3.30.
b15 b3 b2 b1 b0
to
Flash ROM clear
1: Clear
2: Not cleared
Parameter for the master
Parameter for the slave
Auto communication start setting
Not used
1: Save
2: Not saved
Table 3.30 Default value of the parameter save area bit
Mode Default value
0 to 2 (master function only)
0005
H
3 to 5 (slave function only) 0006
H
6 to 8 (master function and slave function) 0007
H
(28) Auto communication start setting (address 0631H/1585)
This setting is used to set whether or not the I/O communication automatically
starts when the power is turned ON or at reset by the parameter saved in the flash
ROM.
0: I/O communication does not start automatically (default value).
1: I/O communication starts automatically.
: The I/O communication does not start automatically when any value other than
0 or 1 is set.