Communication With The Local Stations - Mitsubishi Electric Q81BD-J61BT11 User Manual

4 FUNCTIONS

4.2.3 Communication with the local stations

Personal computer
Program
4)
mdReceive Read
4)
mdReceive
Read
6)
mdSend
Write
6)
mdSend Write
9)
mdSend
Write
9)
mdSend
Write
14)
Read
mdReceive
14)
Read
mdReceive
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The following explains an overview of the communication between the master station
and the local stations.
(1) Communication between the master station and the local stations
by cyclic transmission
The data communication between programmable controller CPUs and personal
computers can be performed in n:n mode using the remote input RX and remote
output RY (bit information used in local station systems) as well as the remote
register RWw and remote register RWr (word information for writing and reading
used in local station systems).
Master station
CC-Link Ver.2 board
1)
Network
parameters
Buffer memory
Remote input RX
3)
Receive area from
Link scan
local station No. 1
3)
Receive area from
Link scan
local station No. 2
to
Remote output RY
7)
Send area to
Link scan
local station No. 1
7)
Send area to
Link scan
local station No. 2
to
Remote register
RWw
10)
Send area to
Link scan
local station No. 1
10)
Send area to
Link scan
local station No. 2
to
Remote register
RWr
13)
Receive area from
Link scan
local station No. 1
13)
Receive area from
Link scan
local station No. 2
to
POINT
The master station only sends data to stations where datalink has been started.
The master station does not send any data to stations where datalink has not been
started.
Local station (station number 1) Local station (station number 2)
Buffer memory
Remote output RY
3)
Own station
(station number 1)
Link scan
send area
3)
Receive area from
Link scan
local station No. 2
to
Remote input RX
7)
Receive area from
Link scan
master station
7)
Receive area from
Link scan
master station
to
Remote register
RWr
10)
Receive area from
Link scan
master station
10)
Receive area from
Link scan
master station
to
Remote register
RWw
13)
Own station
(station number 1) Link scan
send area
13)
Receive area from
Link scan
local station No. 2
to
Network
parameters
1)
Automatic refresh
parameters
Buffer memory
Remote output RY
5)
Receive area from
Automatic refresh
local station No. 1
2)
Own station
(station number 2)
Automatic refresh
send area
to
Remote input RX
8)
Receive area from
Automatic refresh
master station
8)
Receive area from
Automatic refresh
master station
to
Remote register
RWr
11)
Receive area from
Automatic refresh
master station
11)
Receive area from
Automatic refresh
master station
to
Remote register
RWw
15)
Receive area from
Automatic refresh
local station No. 1
12)
Own station
(station number 2) Automatic refresh
send area
to
MELSEC
PLC CPU
Network
parameters
Automatic refresh
parameters
Y
Y
X
X
D
D
D
D
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