Automatic Return Function; Cable Fault Detection Function - Mitsubishi Electric MELSEC Q Series Reference Manual

4.4.3

Automatic return function

When a station disconnected from a network due to a data link error recovers from the error, the station is
automatically reconnected to the network and restarts data link.
Control station
No.1
Normal station
No.4
● 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.)
However, if the constant link scan time is set, it may take 100ms or longer from the line status change to the
reconstruction of the loop.
4.4.4

Cable fault detection function

A cable fault can be detected as a cause of a communication error.
The CC IE Control diagnostics makes troubleshooting easy. (
Control station
No.1
Normal station
No.4
Normal station
No.2
When recovered
from fault
Normal station
No.3
Down
Communication
error
Communication
error
Control station
No.1
Normal station
No.4
Page 541, Section 10.4)
Normal station
No.2
A cable fault is detected as the
cause of the communication error.
Normal station
No.3
CHAPTER 4 FUNCTIONS
Normal station
No.2
Normal station
No.3
Reconnected
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