11: D
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ANUAL
FC9Y-B1268
Special Data Registers for Data Link Communication Error
In addition to data registers assigned for data communication, the master station has 31 special data registers and each
slave station has one special data register to store data link communication error codes. If any communication error
occurs in the data link system, communication error codes are set to a corresponding data register for link communica-
tion error at the master station and to data register D8069 at the slave station. For details of link communication error
codes, see below.
When data link master/slave is used on port 3 through port 7, data link communication error codes are not stored in
D8069 through D8099. Those error codes are stored in consecutive data registers starting from the data register specified
in Function Area Settings.
If a communication error occurs in the data link communication system, the data is resent two times. If the error still
exists after three attempts, then the error code is set to the data registers for data link communication error. Since the
error code is not communicated between the master and slave stations, error codes must be cleared individually.
Master Station
Special Data
Register
Data Link Communication Error Data
Special Data
Register
Data Link Communication Error Data
D8069
Slave station 1 communication error
D8085
Slave station 17 communication error
D8070
Slave station 2 communication error
D8086
Slave station 18 communication error
D8071
Slave station 3 communication error
D8087
Slave station 19 communication error
D8072
Slave station 4 communication error
D8088
Slave station 20 communication error
D8073
Slave station 5 communication error
D8089
Slave station 21 communication error
D8074
Slave station 6 communication error
D8090
Slave station 22 communication error
D8075
Slave station 7 communication error
D8091
Slave station 23 communication error
D8076
Slave station 8 communication error
D8092
Slave station 24 communication error
D8077
Slave station 9 communication error
D8093
Slave station 25 communication error
D8078
Slave station 10 communication error
D8094
Slave station 26 communication error
D8079
Slave station 11 communication error
D8095
Slave station 27 communication error
D8080
Slave station 12 communication error
D8096
Slave station 28 communication error
D8081
Slave station 13 communication error
D8097
Slave station 29 communication error
D8082
Slave station 14 communication error
D8098
Slave station 30 communication error
D8083
Slave station 15 communication error
D8099
Slave station 31 communication error
D8084
Slave station 16 communication error
—
—
If any slave stations are not connected, master station data registers which are assigned to the vacant slave stations can
be used as ordinary data registers.
Slave Station
Special Data Register
Data Link Communication Error Data
D8069
Slave station communication error
Notes: Slave station data registers D8070 through D8099 can be used as ordinary data registers.
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