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6. BIDIRECTIONAL
PROTOCOL
COMMUNICATIONS
MELSEC
QnA
6.4
Bidirectional Protocol Setting Items
The following describes the buffer memory and inputloutput signals that are set when using the
bidirectional protocol to send and receive data in this guidebook. (See Appendixes 1 and 2 for the
QC24 buffer memory table and inputloutput signals table.)
6.4.1
Buffer memory setting
With the bidirectional protocol data communications described in this guidebook, the sequence
program reads and writes only the areas shown below.
jdress Hexadeci-
_ _ _ ~
mal (Decimal1
OH(0)
gDH(157)
257H(599)
258H(600)
~
401 H(1025)
to
5FFH(1535)
600H(1536)
601 H(1537)
to
7FFH(2047)
Buffer Memory Address Name
I
Default
Value
I
-ED OFF request (right side
: RUN-RD)
I
0
3esponse watchdog (timer 1) designation
I
32H
(5
seconds)
lata transmission result
:
0 (No errors)
I
lata receDtion result
CHI
send/
receive
Send area
Receive
area
I
0 (No errors)
Send data count
I
0
Send data (storage)
1
5 1
1 words
I
I
0
Receive data count
(read data count)
I
I
I
I
I
0
I
I
I
I
Receive data (storage)
I
51 1 words
I
I
0
I
6 - 7
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