Continuing The Data Link Even When The Master Station Is Faulty; (Standby Master Function) - Mitsubishi MELSEC Q Series User Manual

4 FUNCTIONS
MELSEC-Q

4.3.6 Continuing the data link even when the master station is faulty

(Standby master function)

This function enables the data link to continue working by switching to a standby
master station (meaning a backup station for the master station) if a system down
occurs in the master station due to a malfunction in the PLC CPU or power supply.
The master station can return to normal mode and to system operation as the standby
master station, even during data-link control by the standby master station, thus
preparing itself for a standby master station system down (master station duplex
function).
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