Explanation Of Each Function Code - Omron SYSDRIVE MX SERIES User Manual

4-2 Function Mode
<Abnormal Response>
Field Configuration
•If an error (aside from a communication error) is found in the query content, the Inverter returns an
exception response without performing any operation.
•To determine the cause of an error, check the function code of the response. The function code of
the exception response is the value of the query function code with 80h added.
4
•Check the details of the error with the exception code.
<No Response>
The Inverter ignores a query and does not respond if:
•The broadcast is received.
•A communication error is detected in receiving a query.
•The query slave address does not correspond with the slave address set for the Inverter.
•The time interval between 2 pieces of data constituting the message is less than a 3.5-character
length.
•Query data length is inappropriate.
Note: Provide a timer in the master to monitor the response, and if no response is returned within

Explanation of Each Function Code

<Reading Coil Status [01h]>
Reads out the coil status (ON/OFF).
(Example)
Read multi-function inputs S1 to S6 on the Inverter with slave address 8.
Refer to the following table for the multi-function input terminal statuses.
Multi-function
input terminals
Terminal status
4-69
Slave address
Function code
Exception code
CRC-16
Code
01h Has specified an unsupported function.
02h Specified address does not exist.
03h Specified data has an unacceptable format.
21h Data is out of the Inverter's range for writing into the holding register.
The Inverter does not allow this function.
• Has attempted to change the register that cannot be changed during operation.
22h • Has issued the enter command during operation (UV).
• Has written into the register during trip (UV).
• Has written into the read-only register (coil).
the set time period, send the same query again.
S1 S2
Coil No. 7 8
ON ON
Description
S3 S4 S5 S6
9 10 11 12
ON OFF ON OFF
Coils 13 and 14 are OFF.