Program Example Of Error Detection In Other Stations - Mitsubishi Electric MELSEC Q Series Reference Manual

8.1.6

Program example of error detection in other stations

The following shows a program example of error detection in other stations.
(1) Overview of the program example
In the program example in this section, the baton pass status and the cyclic transmission status of each station is
monitored and some network errors in other stations are detected in a system configured with three stations.
● When a disconnection or a reconnection of stations is detected, the CC-Link IE Controller Network executes the line
control in all stations to reconstruct the loop.
● During the line control processing, the baton pass status (SW00A0 to SW00A7) and the cyclic transmission status
(SW00B0 to SW00B7) are turned ON for up to 100ms. (Normally for up to 50ms.)
Therefore, set a value of error monitoring timer to more than 100ms and within the allowable range of your system.
(2) Devices used in the program example
(a) Link special relay (SB) and link special register (SW)
Device
SB0047 Baton pass status of own station
SB0049 Data link status of own station
SW00A0.0 Baton pass status of station No. 1
SW00A0.1 Baton pass status of station No. 2
SW00A0.2 Baton pass status of station No. 3
(b) Devices used by the user
Device
M10 Own station normal
M20 Faulty station
Description
Description
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CHAPTER 8 PROGRAMMING
Device Description
SW00B0.0 Cyclic transmission status of station No.1
SW00B0.1 Cyclic transmission status of station No.2
SW00B0.2 Cyclic transmission status of station No.3
Device Description
T1 Station No. 1 error monitoring timer
T2 Station No. 2 error monitoring timer
T3 Station No. 3 error monitoring timer
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