Station Number Overlap Checking Function - Mitsubishi Electric MELSEC QS Series User Manual

4
FUNCTIONS

4.2.5 Station number overlap checking function

This function checks the status of the remote stations connected to the safety master
station to check if there is duplication in occupied station numbers and if more than one
station have station number 0 in the system.
(1) Checking for occupied station number overlap
When the PLC is powered OFF and then ON or when data link is started due to reset
cancellation of the safety CPU module, this function checks remote stations for any
duplication in occupied station numbers.
(Example) There is duplication in occupied station numbers.
(2) Checking for duplication of station number 0
When the PLC is powered OFF and then ON or when data link is started due to reset
cancellation of the safety CPU module, this function checks if any other master station
(station number set to 0) exists on the same network and is performing
communication.
Remote device station (station number 1,
number of occupied stations: 2)
Safety remote I/O station (station number 2,
number of occupied stations: 1)
1) When duplication is detected, the "ERR." LED on the safety master module
flashes, and the status of the detected duplication is stored to SW0098 to
SW009B (station No. duplication status).
2) Even if an overlap exists, the safety master station continues the data link with
the remaining normally functioning stations.
3) Correct the station number setting of the remote station and reset the PLC
CPU on the safety master station. Doing so will turn off the "ERR." LED on the
safety master module, clearing the data stored in SW0098 to SW009B.
1) When duplication is detected, the "ERR." LED on the safety master module
turns ON, and an error code is stored to SW006A (switch setting status),
turning ON SB006A (switch setting status).
2) Reducing the safety master stations to one and resetting its PLC CPU will turn
off the "ERR." LED and clear the data of SW006A.
4.2 Detailed Explanation of Functions
4.2.5 Station number overlap checking function
Station Station
number 1 number 2
Station
number 2
Overlap
1
2
3
4
5
6
7
8
4
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