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2-3-3
Composite Read from Variable Area
This service reads in order the contents of specified addresses in the variable area.
• Service Request PDU
Variable
MRC SRC
type
0 1 0 4
2
2
2
• Service Response PDU
Response
MRC SRC
0 1 0 4
2
2
Note: The read data is read together with the variable type in the order specified by the command.
(1) Variable Type and Read Start Address
For details on variable types and read start addresses, refer to Section 3 Communications Data for
CompoWay/F.
(2) Bit Position
Bit access is not supported. Fixed to "00."
(3) Number of Read Data Items (Variable Type + Read Data + Bit Position Counted As 1 Item)
Read data length
For double word (variable type C1 or C3)
For word (variable type 81 or 83)
Note: The following table gives the maximum number of read data items when double-word data and word data
are used together.
Double word
For variable type C1
or C3
20
19
18
18
17
17
16
15
15
14
14
13
12
12
E5@D Digital Temperature Controllers Communications Manual (H225)
2 CompoWay/F Communications Procedures
Bit
Read
position
address
0 0
4
2
Variable
Read data
type
code
4
2
Number of elements ×8 or 4
Composite Read
Word
For variable type 81
or 83
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Read
Bit
Variable
address
position
type
0 0
2
4
2
Variable
Read data
type
2
Number of elements ×8 or 4
Number of read data items
20 max.
25 max.
Composite Read
Double word
Word
For variable type C1
For variable type 81
or C3
or 83
11
14
10
15
9
16
8
17
7
18
6
19
8
20
4
21
3
22
2
23
1
24
0
25
2
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