Error Code Description - Eaton M-Max Series User Manual

Structure of Exception Message
Address (of the master request)
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Function code (of the master request): MSB is set to 1
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(for example, with function code 06 = 1000 0110)
Data field contains the error code (is described in the
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following table)
CRC
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Error Code Description

Exception Code Meaning
01 Illegal function
02 Illegal data address
03 Illegal data value
04 Slave device error
06 Slave device busy
Example:
Master request that contains a non-existent data address.
Master request: 01 06 0802 0001 EBAA (hex)
hex Name
01 Slave address
06 Function code (here: Write a holding register)
0802 2050 (dec). The ID number of the written register is
2051 (dec) as the master PLC has an offset of +1
0001 Content (2 bytes) for register 42051:
0000 0000 0000 0001 (bin)
EBAA CRC
Slave response: 01 86 02 C3A1 (hex)
hex Name
01 Slave address
86 Function code (here: Write a holding register)
MSB was set to 1
02 Error code: Stated address not found.
C3A1 CRC
Description
This function is not supported
The address was not found
The data format is not permissible or is incorrect
Occurrence of a non-regenerative error while the slave attempted to execute a slave response
The slave has received the master request error-free. However, it is engaged in processing a
lengthy command
M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.com
Serial Interface (Modbus RTU)
No Slave Response:
In the following cases, the frequency inverter ignores the
request and does not send a reply:
On receiving a broadcast request
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If the request contains a transmission error
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If the slave address in the request does not match that of
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the frequency inverter
With an invalid data length,
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(for example, reading of 12 registers) error message F08 is
triggered in the MMX
With a CRC or parity error
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With a CRC error the value of system parameter S2.1 is
increased by 1 (xx = number of faulty messages)
If the time interval between the messages is less than
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3.5. characters
The master must be programmed to repeat the request if it
does not receive a response within a specified time.
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