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MELSEC-
A
6 EXCHANGING DATA WITH AN EXTERNAL DEVICE
(2) Timing chart
2)
3)
5)
6)
7)
8)
9) 10)
11) 12)
4)
Carried out with sequence program
Carried out by R2
External device
Transmission
Intelligent device station
access request (RY(n+1)E)
Intelligent device station
access complete (RX(n+1)E)
Transmission request signal
(RYn0)
Transmission normal/error
complete signal (RXn0/RXn1)
Word device
Master station Transmission buffer
1)
Master station Reception buffer
R2 Transmission area
Programmable
controller CPU
No. Details Control side
1) The transmission data is written into the master station transmission buffer. Program
2) The intelligent device station access request (RY(n+1)E) turns ON. Program
3) The data in the master station transmission buffer is written into the R2 transmission area. R2
4) The control data is stored in the reception buffer. R2
5)
When the writing is completed, the intelligent device station access complete (RX(n+1)E) turns
ON.
R2
6) The intelligent device station access request (RY(n+1)E) turns OFF. Program
7) The intelligent device station access complete (RX(n+1)E) turns OFF. R2
8) The transmission request signal (RYn0) turns ON. Program
9) The data is transmission from the R2 transmission area to the external device. R2
10)
The transmission normal complete signal (RXn0) or transmission error complete signal (RXn1)
turns ON.
R2
11) The transmission request signal (RYn0) turns OFF. Program
12) The signal turned ON in step 9) turns OFF. R2