Omron E5AN Communications Manual page 92

SECTION 5 Modbus Communications Procedure
Response Frame
Slave
address
1
Slave address
Function code
Write start address
Number of elements
CRC-16
5-12
Function Write
code start address
H'10
1 2
Name
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, see CRC-16 Calculation
Example in 5.1 Data Format on page 5-3.
Number of
CRC-16
Elements
2
2 bytes
Description