54
7 OPTION
54
OPTION
Chapter
7
Exception code = 01
A nonexistent function code has been specified.
Check the function code.
Exception code = 02
An unusable address has been specified.
- Check the start address or start address + (number of coils or number of statuses or number of
registers).
(Function code 1 to 6, 15, 16)
Exception code = 03
The specified number is out of range.
- Check to see if the (number of coils or number of statuses or number of registers) is within the
reading range.
(Function code 1 - 4)
- Check to see if the output value is 0x0000 or 0xFF00.
(Function code 5)
- Check to see if the output value is 0x0000 to 0xFFFF.
Or, check for designation at up to start address 54.
(Function code 6)
- Check to see if the (number of coils or number of registers) is within the range.
(Function code 15, 16)
- Check to see if the number of bytes is a value obtained from the (number of coils or number of
registers).
(Function code 15, 16)
- Check to see if the total number of bytes in the transmitted format is correct.
(Function code 1 - 6, 8, 15, 16)
When the following errors occur, each slave does not return a response
regardless of the request from the master.
- The specified slave address No. is inconsistent with the self-address.
- The error check code is inconsistent.
- A parity error or any other communication error is detected.
- The character gap in frame-configuring data is 1.5 or more characters.
- Slave address No. is set at "0".
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