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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
7.2.2 Transmitting using the transmission frame 2 area
Frame transmission, with up to 100 frames added, is possible.
Using the transmission table (
R2
122H to 185H) of the No. designated in the
transmission table head No. designation (
R2
120H), the frames corresponding to the
No. of points designated in the No. of transmission table (
R2
121H)
are transmitted.
When designating a default registration frame for the transmission table, refer to
section 7.5.1.
When designating a user registration frame, refer to section 7.5.2.
R2
2
3
1
H
(SOH)
2
H
(STX)
107
H
(ETX, FFF1
H
)
...
Buffer memory
...
...
Transmission data size
Transmission data
Transmission data
EEPROM (Registration frame)
4AF
H
(User registration frame)
ETX, FFF1H
(No.4)
STX
(No.2)
Random data
section (No.3)
Data stored in transmission
area
......
*1 When designating data written into the transmission area, designate 8000H.
*2 When R2 is the default value, indicates the buffer memory address.
Transmission table head No.
No. of transmission table
Transmission table designation
R2 122
H
R2 120
H
)(
R2 185
H
R2 121
H
)(
R2 123
H
R2 124
H
R2 125
H
R2 200
H
R2 201
H
R2 3FF
H
No. 1
No. 2 (2
H
)
No. 3 (8000H)
No. 4 (107
H
)
No. 100
External
device
...
Transmission area
*
1
*
2