Mitsubishi MELSEC AJ65BT-R2 User Manual page 174

8 OTHER FUNCTIONS
No.
1) The transmission data is written to the automatic update buffer (transmission area).
2) The transmission request signal (RYn0) turns ON.
The transmission data in the master station buffer memory is read out, and stored in the
3)
transmission area.
4) The transmission data is transmitted to the external device.
5) The transmission cancel request signal (RYn1) turns ON.
6) Transmission to the external device is canceled.
7) When the transmission is canceled, R2 turns the transmission error complete signal (RXn1) ON.
8) The transmission request signal (RYn0) and transmission cancel request signal (RYn1) turn OFF.
9) The transmission error complete signal (RXn1) turns OFF.
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.
Cancel
execution
R2 normal
POINT
•
Configure the following interlock circuit to prevent the transmission cancel request signal
from being accepted during processes other than the transmission request.
Transm ission
cancel
com m and
(3) Program
The program for canceling the data transmission is shown below.
Refer to section 5.1 for details on the program conditions.
Transmission Transmission
request
normal
signal complete
(RYn0)
signal (RXn0)
Details
Transm ission
error
com plete
signal (RXn1)
8 - 2
MELSEC-A
Control side
Program
Program
R2
R2
Program
R2
R2
Program
R2
Set transmission
cancel request (RYn1)
Reset transmission
request (RYn0)
Reset transmission
cancel request (RYn1)
SET (RYn1)