Checking Setting Contents And Errors - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
N:N Network
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.
Device
D8173 Station number settings status
D8174 Slave station quantity setting status
D8175 Refresh range setting status
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.
Device
M8063 Serial communication error 1 (ch 1)
M8438 Serial communication error 2 (ch 2)
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.
Device
D8063
D8438
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
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.
FX Series
FX , FX , FX
1N 1NC
FX , FX , FX
2NC 3S
FX , FX , FX
3GC 3U
FX , FX
0N 1S
B-50
Name
Name
Name
Serial communication error code 1 (ch 1)
Serial communication error code 2 (ch 2)
Device
,
2N
, M8191
3G
Data transfer sequence ON flag
3UC
M503
Provided to check the station number.
Provided to check the number of slave stations.
Provided to check the refresh range.
Turns ON when abnormality occurs during serial communication
using ch 1.
Turns ON when abnormality occurs during serial communication
using ch 2.
Error code
6308
6309
3808
3809
, FX , FX , FX and FX
3S 3G 3GC 3U
Name
Remains ON while data transfer is being
executed.
9 Troubleshooting
9.5 Checking Setting Contents and Errors
Description
Description
Description
N:N Network parameter setting error
N:N Network setting error
N:N Network parameter setting error
N:N Network setting error
PLCs when the power is
3UC
Description