Receiving Data From An External Device - Mitsubishi MELSEC AJ65BT-R2 User Manual

6 EXCHANGING DATA WITH AN EXTERNAL DEVICE

6.4.2 Receiving data from an external device

Programmable controller CPU
Bit device
Word device
The method for receiving data from an external device using the
transmission/reception buffer is explained in this section.
(1) Flow of process
The flow of the process for receiving data from an external device using the
transmission/reception buffer is shown below.
Master station
Remote
input (RX)
4) Intelligent device
station access
request ON
8) Intelligent device
station access
request OFF
Remote
output (RY)
11) Reception read
complete ON
13) Reception read
complete OFF
3) Control data
Transmission
buffer
10) Reception data
Reception
buffer
* When using the RIRD (RIRCV) command, the steps 4) to 9) are carried out automatically.
5) Read command
2) Reception normal/
error read request
ON
7) Intelligent device
station access
complete ON
Remote
9) Intelligent device
input (RX)
station access
complete OFF
12) Reception normal/
error read request
OFF
Remote
output (RY)
OS reception
area
6) Control data +
reception data
Reception
area
6 - 24
MELSEC-A
R2
Random data
RS-232-C
1) Data reception
External
device
Trans-
mission