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MELSEC-
A
8 OTHER FUNCTIONS
No. Details Control side
1) The transmission data is written to the automatic update buffer (transmission area). Program
2) The transmission request signal (RYn0) turns ON. Program
3)
The transmission data in the master station buffer memory is read out, and stored in the
transmission area.
R2
4) The transmission data is transmitted to the external device. R2
5) The transmission cancel request signal (RYn1) turns ON. Program
6) Transmission to the external device is canceled. R2
7) When the transmission is canceled, R2 turns the transmission error complete signal (RXn1) ON. R2
8) The transmission request signal (RYn0) and transmission cancel request signal (RYn1) turn OFF. Program
9) The transmission error complete signal (RXn1) turns OFF. R2
POINT
•
Transmission using the monitor transmission function cannot be canceled with the
transmission cancel function.
•
To resend data that has been canceled with the transmission cancel function, carry
out the transmission process again.
The data will be transmitted from the head.
(3) Program
The program for canceling the data transmission is shown below.
Refer to section 5.1 for details on the program conditions.
Cancel
execution
R2 normal
Set transmission
cancel request (RYn1)
Reset transmission
request (RYn0)
Reset transmission
cancel request (RYn1)
POINT
•
Configure the following interlock circuit to prevent the transmission cancel request signal
from being accepted during processes other than the transmission request.
SET (RYn1)
Transmission
cancel
command
Transmission
request
signal
(RYn0)
Transmission
normal
complete
signal (RXn0)
Transmission
error
complete
signal (RXn1)