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2 CompoWay/F Communications Procedures
2-3
Detailed Description of the Services
2-3-1
Read Variable Area
This service reads data from the variable area.
• Service Request PDU
Variable
MRC SRC
type
0 1 0 1
2
2
2
• Service Request PDU
Response
MRC SRC
0 1 0 1
2
2
(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 Elements
Number of elements
Double word
(variable type C0, C1, or C3)
Word
(variable type 80, 81, or 83)
(4) Response Code
• Normal Completion
Response code
0000
2 - 8
Read start
Number of
Bit
address
position
elements
0 0
4
2
4
Read data (for number
code
of elements)
4
Number of elements
× 8 or 4
0000
0001 to 0019
(1 to 25)
0001 to 0032
(1 to 50)
Normal completion
Processing
The read operation is not performed (read data is not
appended to the service response PDU), and processing
ends in a normal completion.
The read operation is performed and processing ends in a
normal completion.
Name
No errors were found.
E5@D Digital Temperature Controllers Communications Manual (H225)
Description
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