Mitsubishi Electronics AJ65bt-r2 사용자 설명서

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MELSEC-A

6   EXCHANGING DATA WITH AN EXTERNAL DEVICE

(2)   Timing chart

1)

2)

3)

4)

5)

7)

6)

8)

9)

10)

11)

12)

13)

Carried out with sequence program
Carried out by R2

External device

Intelligent device station 
access request (RY(n+1)E)

Intelligent device station
access complete (RX(n+1)E)

Master station  Transmission buffer

Master station  Reception buffer

R2                    Reception area

OS reception area

Reception read complete 
signal                    (RYn2)

Reception normal/error read
request signal  (RXn2/RXn3)

Word device

Programmable
controller CPU

No.

Details

Control side

1)

The reception data is stored in the reception area via the OS reception area.

R2

2)

When the reception from the external device is completed 

(

*

1

)

, the reception normal read request

signal (RXn2) or reception error read request signal (RXn3) turns ON.

R2

3)

The read control data is stored in the master station transmission buffer.

Program

4)

The intelligent device station access request signal (RY(n+1)E) turns ON.

Program

5)

The contents set in the control data are conveyed to R2.

R2

6)

The control data and reception data are stored in the master station reception buffer.

R2

7)

The intelligent device station access complete signal (RX(n+1)E) turns ON.

R2

8)

The intelligent device station access request signal (RY(n+1)E) turns OFF.

Program

9)

The intelligent device station access complete signal (RX(n+1)E) turns OFF

R2

10) The reception data is read from the master station reception buffer.

Program

11) The reception read complete signal (RYn2) turns ON.

Program

12) The signal turned ON in step 2) turns OFF.

R2

13) The reception read complete signal (RYn2) turns OFF.

Program

*1 Indicates the storage of the reception end data size data or the data to the reception end frame into the

reception area.