Mitsubishi Electronics AJ65bt-r2 ユーザーズマニュアル

8 - 3

MELSEC-A

8   OTHER FUNCTIONS

8.2 Forcibly completing reception

This function is used to forcibly complete the reception when the reception read
request signal is not ON, and to read the currently received data.
With this function, if the reception data size data is not received even after a set time,
the reception is forcibly completed when data, for which the head frame/end frame
cannot be pinpointed, is received.
The outline of this function is explained using the buffer memory automatic update
function.

(1)   Flow of process

R2

RS-232-C

Master station

Bit device

Word device

Remote 

input (RX)

Remote 

output (RY)

Remote 

output (RY)

Remote 

input (RX)

Programmable controller CPU

External

device

5) 

9) 

8) Reception read complete ON

10) Reception read complete OFF

OS reception
area

Reception
area

6) Forced reception complete
    request OFF

2) Forced reception complete
    request ON

7) Reception data read

Automatic 
update
buffer

4) Automatic read

3) Transmit to
     reception area

Reception

1) Data reception

Reception normal/
error read request
ON
Reception normal/
error read request
OFF

(2)   Timing chart

7)

9)

10)

8)

1)

2)

6)

5)

3)

4)

Carried out with sequence program
Carried out by R2

External device

Programmable
controller CPU

Master station  

R2                    Reception area

OS reception area

Automatic update area
(reception area)

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

Forced reception complete 
request signal         (RYn3)

Reception read complete 
signal                   (RYn2)

Word device