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CHAPTER 11 PROGRAMMING
11
11.3 Using Link Special Relay (SB) and Link Special Register (SW)
(b) Checking data link status (own station)
1. Link scan time can be checked in SW0060 to SW0062.
2. If an error occurs in data link, either of the following link special relays (SB) will turn on.
• Baton pass status (own station) (SB0047)
• Data link status (own station) (SB0049)
3. The cause of error will be stored in the following link special registers (SW).
• Baton pass status (own station) (SW0047)
• Cause of baton pass interruption (SW0048)
• Cause of data link stop (SW0049)
Number Description Number Description
SB0047 Baton pass status (own station) SW0047 Baton pass status (own station)
SW0048 Cause of baton pass interruption
SB0049 Data link status (own station) SW0049 Cause of data link stop
SW0060 Maximum link scan time
SW0061 Minimum link scan time
SW0062 Current link scan time