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10
DEDICATED INSTRUCTIONS
(4) Response message storage devices
Device
Item
Set the size (function code + data) of the received response message in byte
Response
units.
(D1)+0
message size
The size for the RTU mode is stored regardless of the frame mode (RTU mode/
ASCII mode).
Set the contents (function code + data) of the received response message.
Data are stored in RTU format (binary) regardless of the frame mode (RTU mode/
ASCII mode).
(Example) When a response message of Read Holding Registers (FC: 03) is
received
<Received response message frame (in ASCII mode)>
(D1)+1
Response
to
message
(D1)+m
<Contents in response message storage devices and their order>
Figure 10.9 Contents in response message storage devices and their order
Table10.12 Response message storage devices
Setting data
Function code
Function code
Number of
*2
read bytes
0
3
0
4
0
(30
)
(33
)
(30
)
(34
)
(30
)
H
H
H
H
H
(H)
(L)
(H)
(L)
(H)
6 bytes
(Calculated with the size for reception in RTU mode regardless of frame mode)
Figure 10.8 Response message example
b15
b8
b7
(D1)+0
00
H
b15
b8
b7
(D1)+1
04
H
b15
b8
b7
(D1)+2
05
H
b15
b8
b7
(D1)+3
34
H
Receive data storage order
(Response message is stored in order from lower-order to
higher-order bytes starting with the smallest device number.)
* 1 The setting side is as described below.
User
: Data are set by the user before dedicated instruction execution.
System: The programmable controller CPU stores the result of dedicated instruction execution.
* 2 The number of read bytes is 4 from "2 (Read points)
Data
Device data
Device data
1
2
0
0
5
1
2
(30
) (30
)
(35
) (31
) (32
) (33
H
H
H
H
H
Reception order
b0
Response message size
06
H
(=6 bytes)
b0
03
H
b0
Response message
00
H
b0
12
H
2 = 4".
10.3 Z(P).MBREQ
Setting
Setting
range
side
-
System
3
4
) (34
)
H
H
(L)
As shown
System
on left
10
9
*1
10
11
- 19
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