Mitsubishi Electric MELSEC-Q Series - Page 311

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CHAPTER 8 PROGRAMMING
8
8.3 Using Link Special Relay (SB) and Link Special Register (SW)
(2) Checking data link
The data link status is checked through the CC IE Control diagnostics, but it also can be checked with link special
relay (SB) and link special register (SW). ( Page 526, Section 10.3)
(a) Check the data link status of other stations
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 of each station (SB00A0)
• Cyclic transmission status of each station (SB00B0)
3. When Baton pass status of each station (SB00A0) is turned ON, the station No. of a station where
an error has occurred is stored in Baton pass status of each station (SW00A0 to SW00A7).
When Cyclic transmission status of each station (SB00B0) is turned ON, the station No. of a
station where an error has occurred is stored in Cyclic transmission status of each station
(SW00B0 to SW00B7).
4. The details of the cause of an error can be checked with the link special relay (SB) and link special
register (SW) of the station No. for a station where the error has occurred.
(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)
No. Description No. 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 of each station
SW00A0
to
SW00A7
Baton pass status of each station
SB00B0 Cyclic transmission status of each station
SW00B0
to
SW00B7
Cyclic transmission status of each 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