N:n Network; Error Code; Diagnostics - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

12.2 N:N Network

12.2.1

Error Code

When occurring the communication error, auxiliary relays (FX
M8191, FX
0N
stored into the data registers (FX
This error code is following the table.
Error
Meaning
code
Comms
01H
time-out error
02H Station No.
error
Comms
03H
counter error
Comms
04H
format error
Comms
11H
time-out error
Comms
14H
format error
21H No slave error
22H Station No.
error
Comms
23H
counter error
Not receive
31H comms
parameter error
M : Master station
*1 Another slave station
12.2.2

Diagnostics

1 ) Check the status of the RD LED and the SD LED provided on each 485BD.
• If both of them are lighted and extinguished, nothing is wrong.
• If the RD LED is lighted/extinguished but the SD LED is not lighted/extinguished (not lighted
at all), check the setting of the station No., the transmission rate (baud rate) and the total
number of slave stations.
• If the RD LED is not lighted/extinguished, check the wiring.
2 ) Make sure that the communication error (FX
each slave station is not turned on and that the data communication flag (FX
FX : M503) is not turned off. When one of the communication error flag is turned on or if the
0N
data communication flag is turned off, check the error code of data registers (FX
D8218, FX
Please see the following section 12.2.1.
: M504 to M511) for error flag is turned ON in the station. And the error code is
2N
Error Check
station station
L M
L M
L M
L M, L
M L
M L
L L *1
L L *1
L L *1
L L *2
L : Slave station
*2 Self station
: D211 to D218).
0N
, FX , FX , FX : D8211 to D8218, FX
2NC 1N 1S
Description
After master station send request
to save station, no answer passing
comms time-out.
Station No. is not agreement
between the master station and the
slave station.
Communication counter is not
agreement between the master
station and the slave station.
Communication format is not right
from slave station.
After slave station send answer to
master station, master station do
not send request to next slave
station.
Communication format is not right
from master station.
The station No. is not in this
network.
Station No. is not agreement
between the master station and the
slave station.
Communication counter is not
agreement between the master
station and the slave station.
When slave station receive request
from master station before
communication parameter.
: M8183 to M8190, FX
2N
Diagnostics 12
, FX , FX , FX
2N 2NC 1N 1S
: D211 to D218).
0N
Checking points
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)
Check wiring
Check wiring
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK), station No. setting
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK), station No. setting
Check station No. setting.
Check wiring
Check wiring
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)
: M504 to M511) in
0N
: M8183 to
: M8191,
2N
: D8211 to
2N
12-2