Improving The System Reliability; Slave Station Cut-Off And Automatic Return - Mitsubishi Electric MELSEC-Q Series User Manual

8.2

Improving the System Reliability

This section describes how to improve the CC-Link system reliability using the functions.
8.2.1

Slave station cut-off and automatic return

The slave-station cut-off function disconnects a slave station that cannot perform data link due to reasons such as
power-off to continue the data link in a normal station.
The automatic return function allows data link to be automatically performed again when the slave station that has
been disconnected from data link returns to the normal state.
Using these functions prevents the entire system from going down when one station goes down. Because no process
is required for a return, time between an error and a return can be shortened.
If a cable is disconnected, data link cannot be performed because the terminating resistors are also disconnected. (The
ERR. LED turns on.)
Master station
128
excluding faulty stations.
Master station
Error
Recovering
from the error
Master station
Remote station Remote station
Continues data link
Returned
Local station
Disconnection
Local station