User`s manual

FX communication
Diagnostics 12
12-2
12.2 N:N Network
12.2.1 Error Code
When occurring the communication error, auxiliary relays (FX
2N
, FX
2NC
, FX
1N
, FX
1S
: M8183 to
M8191, FX
0N
: M504 to M511) for error flag is turned ON in the station. And the error code is
stored into the data registers (FX
2N
, FX
2NC
, FX
1N
, FX
1S
: D8211 to D8218, FX
0N
: D211 to D218).
This error code is following the table.
M : Master station L : Slave station
*1 Another slave station *2 Self 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
2N
: M8183 to M8190, FX
0N
: M504 to M511) in
each slave station is not turned on and that the data communication flag (FX
2N
: M8191,
FX
0N
: M503) is not turned off. When one of the communication error flag is turned on or if the
data communication flag is turned off, check the error code of data registers (FX
2N
: D8211 to
D8218, FX
0N
: D211 to D218).
Please see the following section 12.2.1.
Error
code
Meaning
Error
station
Check
station
Description Checking points
01H
Comms
time-out error
LM
After master station send request
to save station, no answer passing
comms time-out.
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)
02H
Station No.
error
LM
Station No. is not agreement
between the master station and the
slave station.
Check wiring
03H
Comms
counter error
LM
Communication counter is not
agreement between the master
station and the slave station.
Check wiring
04H
Comms
format error
LM, L
Communication format is not right
from slave station.
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK), station No. setting
11H
Comms
time-out error
ML
After slave station send answer to
master station, master station do
not send request to next slave
station.
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)
14H
Comms
format error
ML
Communication format is not right
from master station.
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK), station No. setting
21H
No slave error L L *1
The station No. is not in this
network.
Check station No. setting.
22H
Station No.
error
LL *1
Station No. is not agreement
between the master station and the
slave station.
Check wiring
23H
Comms
counter error
LL *1
Communication counter is not
agreement between the master
station and the slave station.
Check wiring
31H
Not receive
comms
parameter error
LL *2
When slave station receive request
from master station before
communication parameter.
Check wiring, power of programmable
controller, RUN/STOP state (RUN is
OK)