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(2) Checking data link status
Data link status is checked by CC-Link IE Field Network diagnostics, but can also be checked through link special
relays (SB) and link special registers (SW). ( Page 124, CHAPTER 9)
(a) Checking the data link status (other stations)
1. Link scan time can be checked in SW005A to SW005B and SW0060 to SW0062.
2. If an error occurs in data link, any of the following link special relays (SB) will turn on.
• Baton pass status (each station) (SB00A0)
• Baton pass status (master station) (SB00A1)
• Data link status (each station) (SB00B0)
• Data link status (master station) (SB00B1)
3. When Baton pass status (each station) (SB00A0) turns on, the station number where an error has
occurred is stored in Baton pass status (each station) (SW00A0 to SW00A7).
When Data link status (each station) (SB00B0) turns on, the station number where an error has
occurred is stored in Data link status (each station) (SW00B0 to SW00B7).
Details on the causes of error can be checked by link special relay (SB) and link special register (SW)
corresponding to the station number where the error has occurred. ( Page 225, Section 11.3 (2) (b))
Remark
If the master station is powered on before slave stations, data link may be reconfigured. During the reconfiguration
(maximum 13 seconds), an error is detected using SB00B0.
Starting up the master station last can prevent data link from being reconfigured.
Number Description Number Description
SW005A Maximum baton pass station
SW005B Maximum cyclic transmission station
SW0060 Maximum link scan time
SW0061 Minimum link scan time
SW0062 Current link scan time
SB00A0 Baton pass status (each station)
SW00A0
to
SW00A7
Baton pass status (each station)
SB00A1 Baton pass status (master station)
SB00B0 Data link status (each station)
SW00B0
to
SW00B7
Data link status (each station)
SB00B1 Data link status (master station)