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

Cc-link ie controller network

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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)

Baton pass status of own station

Data link status of own station

Baton pass status of station No. 1

Baton pass status of station No. 2

Baton pass status of station No. 3

(b) Devices used by the user

Own station normal

Faulty station

CHAPTER 8 PROGRAMMING

Cyclic transmission status of station No.1

Cyclic transmission status of station No.2

Cyclic transmission status of station No.3

Station No. 1 error monitoring timer

Station No. 2 error monitoring timer

Station No. 3 error monitoring timer

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