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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
1) Designating to the buffer memory
The RX/RY/RW reference special characters are written directly after
the designating character.
(Example) To 123
H for RW, write as follows in the buffer memory.
FF
H
DA
H
123
H
42
H
DA
H
01
H
41
H
FF
H
23
H
(H) (L)
FF
H
23
H
45
H
42
H
DA
H
01
H
(H) (L)
RW designation: 123
H
or
Previous designation data Previous designation data
Previous designation data
2) Designating RX/RY/RW
The RX/RY/RW designation in the 3rd and 4th bytes of the RX/RY/RW
reference special characters are designated as follow.
b15 b0b13 b12 b11
00/1
0
1
RY
RX
RWw
RWr
∼
Device No.
Device type
For RX/RY
designation
For RW
designation
∼
POINT
•
During frame transmission or monitor transmission, if the results of analyzing
and developing the user registration frame containing a special character
exceeds 2048 bytes, the "transmission data size over error (BB92
H) will occur.
•
When using a special character (special character code C0H, C1H, D0H) to
designate the registration frame No., if the same registration frame No. is
designated in that designated registration frame, a special character cannot be
contained.
FF
H
D0
H
The special character No. cannot contain the C0
H
,
C1
H
or D0
H
character in the registration frame indicated
by RW designated with the RX/RY and RW designation.
For RX/RY, RW designation