Riken Keiki 70D Series, Communication Function Manual

Page: 47 / 70

3. Modbus/TCP Communication Functions 3-4. Exceptional response
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3-4. Exceptional response
3-4-1. When non-supported function is specified
Examples of data:
Query
000000000006010400000001 Function code = 0x04
Response 000000000003018401 Exceptional responses 01 (incorrect function)
Description
Supported functions in GD-70D-EA are Read Holding Register (0x03), Preset Multiple Registers (0x10).
3-4-2. When the specified address is out of the range
Examples of data:
Query
000000000006010301000001 Address = 40257
Response 000000000003018302 Exceptional response 02 (incorrect data address)
Description
The address of GD-70D-EA ranges from 40001 to 40256.
3-4-3. When access to the address not within the range is
specified
Examples of data:
Query
000000000006010300FF0002 Read two registers from address 40256
Response 000000000003018303 Exceptional response 03 (incorrect data)
Description
When the address specification is within the range while specification of the number of data exceeds the
last address (40256)
3-4-4. When writing to the unwritable address is specified
Examples of data:
Query 00000000000D0110002E000306000503E80000
Write three registers from address 40047 (address 40049 is unwritable)
Response 000000000003019003 Exceptional response 03 (incorrect data)
Description
If any address within the specified range of writing is unwritable, overall function causes an error resulting
in a state where writable addresses not to be written.