84
6
. Detailed settings for communications
6.3 CompoWay/F (continued)
●
Service details
Addresses, numbers of elements, and data re shown in hexadecimal notation.
■
Variable area read (0101)
Variable area is read.
Service request PDU
Service response PDU (normal)
• Variable type and address to start reading
Refer to "6.4 Address map" for the different variable types and the start reading address.(
• Bit position
This product does not support bit access. Fixed at "00".
• Number of elements
Specifies the number of variables to read.
• When the start reading address is an address within the variable area and the end reading address (the start
reading address plus the number of elements) exceeds the valid addresses of the variable area, then if the
number of data up to the end of the end address is within the range specified by the number of elements,
reading is done and the end is normal. In this case, the number of data read will be fewer than the number of
elements specified in the command. Further, if the start reading address is outside of the variable area, there
will be a start address out of range error.
• Response code
Refer to “List of response codes” for details about each response code. (
MRC
SRC
Variable
Type
Start reading
address
Bit
Position
Number of
elements
0
1
0
1
C
0
0
0
2
2
2
4
2
MRC
SRC
Response code
Read data (For the number of elements)
0
1
0
1
2
2
4
8×n(n:0 to 25)
Number of elements
Processing
0000
Nothing is read and the end is normal.
(Read data is not appended to the service response PDU)
0001 to 0019
A maximum of 25 (H'19) are read and the end is normal.
