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7. INITIAL SETTING OF TRANSMISSION CONTROL DATA TO
BUFFER MEMORY
MELSEC-A
7.4.2
Specifying no-protocol receive completion data length (fixed length)
How to complete the data receive and set the data length are given below
a
along with a sequence program example.
ietting methodl
Buffer memory address lO8H
I
Write the amount of received data
(defauit 127 words)
'OINTS
(1) Set the length of data to complete the data receive in the following
ranges:
Length of data received
a
no-protocol mode buffer size (when word
units are set)
Length of data received
a
no-protocol mode buffer size
x
2 (when byte
units are set)
If the received data length is larger than the no-protocol mode buffer
size, then it is automatically set equal to the no-protocol mode buffer
size.
(2) Section 7.4.3 describes the selection of a word or byte unit for the
data length to complete data receive.
(3)
If the receive-completed code is set, the read request for the received
data is transmitted when the completed code or the set data length
(whichever comes first) is received. (Xnl is ON)
(4) To read the received data by fixed length without setting the com-
pleted code, do the following setting:
b15
to
b 8 C b 7 t o b 0
Write FFFFH.
Buffer memory address 1OOH
Buffer memory address 108H
'%s
Write the length of received data
(default : 127 words)
I
To set the fixed length at which data receive is complete to 15 words in the case of the re;
of received data only by fixed length (AlSJ71C24 I10 addresses 80 to 9F)
(Sequence Program)
TOP
H8
H1OO
HFFFF
K1
-
TO specify the fixed length, write HFFFF
to buffer memory address 100H.
H8
H I 0 8
K15
K1
-
Write
'15'
to buffer memory address 108H
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