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4   FUNCTIONS 

MELSEC-QnA 

 

4.9 Setting the Status of Input Data from a Data Link Faulty Station 

The input (received) data status from a data-link faulty station can be set. 

 

(1)   Target input (received) data 

The target buffer-memory area is shown below: 

 

Master station

Remote input (RX)

Station No.1

Station No.2
Station No.3
Station No.4

Remote output (RY)

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWw)

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWr)

Station No.1

Station No.2
Station No.3
Station No.4

Remote I/O station 

(station No. 1)

Input

Output

Station No.1

Station No.2
Station No.3
Station No.4

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWr)

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWw)

Station No.1

Station No.2
Station No.3
Station No.4

Local station 

(station No. 4)

Station No.1

Station No.2
Station No.3
Station No.4

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWr)

Station No.1

Station No.2
Station No.3
Station No.4

Remote register 

(RWw)

Station No.1

Station No.2
Station No.3
Station No.4

Remote output (RY)

Remote register (RWr)

Remote input (RX)

Remote output (RY)

Remote input (RX)

Remote output (RY)

Local station 

(station No. 3)

Remote device station 

(station No. 2)

Remote input (RX)

Remote register (RWw)

.....Target area of keep/clear.

.....Area that is kept regardless of setting.

 

 

(2)   Setting method 

This is set with the master/local module's "condition setting switch (DIP switch) 
SW4". 
OFF .......Clear (setting at shipment) 
ON .........Keep the status right before error 

 

POINT 

 

When the data-link fauly station is set as an error-invalid station, the input data from that 
station (remote input RX, remote output RY) are kept, regardless of the SW4 setting.