B-50
FX Series PLC User's Manual - Data Communication Edition
N:N Network
9 Troubleshooting
9.5 Checking Setting Contents and Errors
9.5 Checking Setting Contents and Errors
1. Checking the setting contents
Verify that the N:N Network is set correctly.
Each FX PLC has devices for checking the setting. Verify that the correct contents are stored in the devices
shown in the table below.
If the correct contents are not stored in the devices above, check the sequence program.
2. Checking setting errors
1) Error flags
If the parameter setting includes an error, the serial communication error flag turns ON.
Verify that the devices shown in the table below are ON.
When using the N:N Network on ch 1, check M8063.
When using the N:N Network on ch 2, check M8438.
2) Error codes
When the serial communication error flag turns ON, the error code is stored in the device specified in the
table below.
Caution
The serial communication error flags and serial communication error codes are not cleared even when
communication is restored.
Serial communication errors are cleared in FX
3S, FX3G, FX3GC, FX3U and FX3UC PLCs when the power is
turned off and on.
Serial communication errors are cleared in other PLCs when the mode is switched from STOP to RUN.
9.6 Checking Absence/Presence of Data Transfer Errors
Verify that link errors have not occurred in the master station and slave stations. Link errors can be checked
using the flags specified below.
9.6.1 Check while data transfer sequence is being executed
While the N:N Network is being executed, the data transfer sequence ON flag remains ON.
Verify that the device specified in the table below is ON.
Device Name Description
D8173 Station number settings status Provided to check the station number.
D8174 Slave station quantity setting status Provided to check the number of slave stations.
D8175 Refresh range setting status Provided to check the refresh range.
Device Name Description
M8063 Serial communication error 1 (ch 1)
Turns ON when abnormality occurs during serial communication
using ch 1.
M8438 Serial communication error 2 (ch 2)
Turns ON when abnormality occurs during serial communication
using ch 2.
Device Name Error code Description
D8063 Serial communication error code 1 (ch 1)
6308 N:N Network parameter setting error
6309 N:N Network setting error
D8438 Serial communication error code 2 (ch 2)
3808 N:N Network parameter setting error
3809 N:N Network setting error
FX Series Device Name Description
FX
1N, FX1NC, FX2N,
FX
2NC, FX3S, FX3G,
FX3GC, FX3U, FX3UC
M8191
Data transfer sequence ON flag
Remains ON while data transfer is being
executed.
FX
0N, FX1S M503
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