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10
DEDICATED INSTRUCTIONS
(4) Response message storage devices
Device
Item
Response
(D1)+0
message size
(D1)+1
Response
to
message
(D1)+m
10
- 19
10.3 Z(P).MBREQ
Table10.12 Response message storage devices
Set the size (function code + data) of the received response message in byte
units.
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)>
Function code
Number of
Function code
read bytes
0
3
0
4
(30
)
(33
)
(30
)
(34
H
H
H
(H)
(L)
(H)
(L)
(Calculated with the size for reception in RTU mode regardless of frame mode)
Figure 10.8 Response message example
<Contents in response message storage devices and their order>
b15
(D1)+0
00
H
b15
(D1)+1
04
H
b15
(D1)+2
05
H
b15
(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.)
Figure 10.9 Contents in response message storage devices and their order
* 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)
Setting data
Data
Device data
*2
1
0
0
0
5
1
)
(30
)
(30
) (30
)
(35
) (31
H
H
H
H
H
Reception order
(H)
6 bytes
b8
b7
b0
Response message size
06
H
(=6 bytes)
b8
b7
b0
03
H
b8
b7
b0
00
Response message
H
b8
b7
b0
12
H
Setting
range
-
Device data
2
2
3
4
) (32
) (33
) (34
)
H
H
H
H
(L)
As shown
on left
2 = 4".
Setting
*1
side
System
System
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