Omron SYSDRIVE 3G3JV, Communications Manual

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Chapter 2
2-9
CompoWay/F Communications Procedures
2-3 Detailed Description of Services
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Read Variable Area
This service reads data from the variable area.
Service Request PDU
Service Response PDU
1.Variable Type and Read Start Address
For details on variable types and read start addresses, refer to Chapter 3 Communications Data.
2.Bit Position
Always “00.” The 3G3JE does not support bit access.
3.Number of Elements
4.Response Code
Normal Completion
Error Completion
Number of elements Processing
0000 The read operation is not performed (read data is not appended to the service
response PDU), and processing ends in a normal completion.
0001 or 0002 The read operation is performed, and processing ends in a normal comple-
tion.
Response code Name Description
0000 Normal completion No errors were found.
Response code Error name Description
1001 Command too long The command is too long.
1002 Command too short The command is too short.
1101 Area type error The variable type is wrong.
1103 Start address out-of-range
error The read start address is out of range.
110B Response too long The number of elements is larger than 0002. (Number
of elements > 0002)
1100 Parameter error Bit position is not 00.
2203 Operation error CPU or EEPROM error
MRC
0 0 0 1
2 2 2 4 2 4
0 1
SRC Variable type Bit position Number of elements Read start address
MRC
0 1
2 2 4 0, 8, or 16
0 1
SRC Response code Read data (for number of elements)