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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
(2) Setting the buffer memory
The items to be set for the buffer memory used when receiving data using frames
are shown below.
R2 buffer memory
address
Name Details
R2
108H to 10BH
Reception head frame
No. designation
R2
10CH to 10FH
Reception end frame
No. designation
When receiving data using frames, designate the statement's head/end
frames. Designate the No. of the default (user) registration frame registered
in the R2 EEPROM.
Up to four sets, each containing a reception head/end frame, can be set.
For the initial value of the reception head/end frame No, refer to section 3.7.
R2 108
H Head frame No. 1
R2 109
H Head frame No. 2
R2 10A
H
Head frame No. 3
R2 10B
H Head frame No. 4
R2 10C
H End frame No. 1
R2 10D
H
End frame No. 2
R2 10E
H End frame No. 3
R2 10F
H
End frame No. 4
1st set
2nd set
3rd set
4th set
0H (0) : No designation
1H to 161H (1 to 353) : Designate default registration frame
3E8H to 4AFH (1000 to 1199) : Designate user registration frame
* When the reception head frame No. is set to 0, the following reception
head frame Nos. will be invalid
1
H
0H
3H
5
H
R2 108
H Head frame No. 1
Invalid
R2 109
H Head frame No. 2
R2 10A
H
Head frame No. 3
R2
10B
H
Head frame No. 4
R2
110H
Reception head
frame/reception end
frame abort
designation
Designate whether the store the data at the received head frame and end
frame sections in the received order into the R2 reception area in the
same manner as the random data section.
When "Do not abort (0)" is designated, the reception head/end frame
section data will also be stored in the reception area.
When "Abort (1)" is designated, the reception head/end frame section
data will be aborted, and will not be stored in the reception area.
0 : Do not abort
1 : Abort (default value)
R2
1B5H
Reception frame
index No. storage
During frame reception, the No. of registration frame set (1 to 4),
designated with the reception head frame No. designation (
R2
108H to
10B
H) and reception end frame No. designation (
R2
10CH to 10FH),
used for reception and read request is stored.
0 : Do not use frames
1 to 4 : nth set designated with reception head/end frame No.