Other Functions; Canceling Data Communication To An External Device - Mitsubishi MELSEC AJ65BT-R2 User Manual

8 OTHER FUNCTIONS

8. OTHER FUNCTIONS
R2 and functions (special functions) other than data communication with an external
device are explained in this section.

8.1 Canceling data communication to an external device

After the transmission request signal (RYn0) has been turned ON, if the transmission
cancel request signal (RYn1) is turned ON before the transmission normal/error
complete signal (RXn0/RXn1) turns ON, the transmission to the external device will be
canceled.
When this function is executed, the transmission error complete signal (RXn1) will turn
ON.
The outline of this function is explained using the buffer memory automatic update
function.
(1) Flow of process
Programmable controller CPU
Bit device
2) Transmission request ON
5) Transmission cancel
request ON
8)
Transmission request OFF
Transmission cancel
request OFF
Word device
1) Transmission data write
(2) Timing chart
Programmable
Word device
controller CPU
Transmission request
signal
Transmission cancel
request signal (RYn1)
Transmission error
complete signal (RXn1)
Master station Automatic update area
(transmission area)
R2
Transmission area
Master station
7) Transmission error
complete ON
9) Transmission error
Remote
input (RX) complete OFF
Remote
output (RY)
3) Automatic read
Automatic
update
buffer
1)
(RYn0)
2)
8 - 1
R2
Remote
input (RX)
Remote
output (RY)
4) Data transmission
Trans-
mission
6) Transmission cancel
area
Transmission data
8)
5)
7)
3)
4)
Transmission
External device
Carried out with sequence program
Carried out by R2
MELSEC-A
External
device
Reception
RS-232-C
9)
6)
8