Random Read Command - Mitsubishi 800 Series User Manual

4 MONITORING SPECIFICATION

4.6.3 Random read command

(1) Random read command
(2) Command format
(3) Communication overview
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This is a command to read data from several different GOT internal devices to
the remote register.
Transfer Direction
RWwm (Higher byte)
RWwm (Lower byte)
Master station GOT
RWwm + 1 to RWwn + F
RWrn to RWrn + D
GOT Master station
RWrn + E, RWrn + F
When reading data from the GOT internal device GD100, 200 and 300 to the
remote register.
PLC CPU
TO
FROM
1) Store the continuous read command data in the master station's remote
register (RWw).
2) Turn on the GOT request flag, and read the data in GD100, 200,and 300 are
read to the remote register (RWr) by storing the command data in the GOT
remote register (RWw).
(Command execution)
The GOT complete flag turns on when the command processing is complete.
3) By link scan, the read data is stored in the master station's remote register
(RWr).
4) Read the data to the PLC CPU using the FROM instruction, etc.
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Addresses
3: Random read setting
When the occupied points are 2 stations
1 to 6 : GOT internal device point to be read
When the occupied points are 4 stations
1 to 14 : GOT internal device point to be read
0 to 1023 : GOT internal device numbers to be read
(Storage for the setting mentioned above)
Stores the data to be read from the GOT internal
device (Storage for the setting mentioned above)
Master station
remote register
RWw0
0303
H
1)
RWw1
0064
H
RWw2 00C8
H
RWw3
012C
H
RWr0
1234
H
4)
RWr1 0E54
H
RWr2
0066
H
MELSEC-GOT
Write data
———
GOT
remote register
RWw0
0303
H
2)
RWw1
0064
H
RWw2 00C8
H
RWw3
012C
H
RWr0
1234
H
3)
RWr1 0E54
H
RWr2
0066
H
2)
GD100
1234
H
GD200
0E54
H
GD300
0066
H
GOT internal device
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