8
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8.3 Using Link Special Relay (SB) and Link Special Register (SW)
8
PROGRAMMING
(b) Checking the data link status of own station
1) Link scan time etc., can be checked in SW005A to SW005B and SW0060 to
SW0062.
2) If an error occurs to data link, either of the following link special relays (SB) will
be turned ON.
• Baton pass status (own station) (SB0047)
• Data link status of own station (SB0049)
3) The cause of an error is 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)
Table 8.14 SB/SW used in checking data link status of own station
No.
Description
No.
Description
SB0047
Baton pass status (own station)
SW0047
Baton pass status (own station)
—
SW0048
Cause of baton pass interruption
SB0049
Data link status of own station
SW0049
Cause of data link stop
—
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
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