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Response Frame
Function
Slave
code
address
H' 10
1
1
Name
Slave address
Function code
Write start address
Number of elements
CRC-16
Response Code
Function code
'
H
90
'
H
10
E5@D Digital Temperature Controllers Communications Manual (H225)
Number of
Write start address
Elements
2
The value from the command frame is entered as-is.
This is the received function code.
When the function ended normally, the function code is left as-is. When
an error occurred, the hexadecimal value of H'80 is added to the function
code to indicate that the response is an error response.
Example: Received function code = H'10
Function code in response frame when an error occurred =
H'90
This is the received write start address.
This is the received number of elements.
This check code is calculated with the data from the slave address to the
end of the data.
For details on the CRC-16 calculation, refer to CRC-16 Calculation
Example in 4-1-1 Command Frame on page 4-2.
Error code
Error name
'
Variable address
H
02
error
'
Variable data error
H
03
'
Operation error
H
04
---
Normal completion
4 Modbus Communications Procedure
CRC-16
2 bytes
2
Description
Cause
The write start address is incorrect.
• The amount of data does not match the
number of elements.
• The byte count is not 2 times the number
of elements.
• The write data is out of the setting range.
The Controller cannot write the data in its
present operating status.
The write data contents are not allowed in
the present operation mode.
• The Communications Writing parameter is
set to "OFF" (disabled).
• Attempted to write to a parameter in setup
area 1 from setup area 0.
• Attempted to write to a protect parameter
from other than the protect level.
• AT execution is in progress.
• Automatic filter adjustment is in progress.
No errors were found.
4
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