Eaton MMX34AA9D0 Series User Manual

04/10 MN04020001Z-EN
Modbus parameters
139
Structure of exception message:
• Address (of the master request)
• Function code (of the master request): MSB is set to 1 (e.g. with
function code 06 = 1000 0110)
• Data field contains the error code (is described in the following
table)
•CRC
Error code description
Example:
Master request that contains a non-existent data address.
Master request: 01 06 0802 0001 EBAA [hex]
Slave response: 01 86 02 C3A1 [hex]
No Slave response:
In the following cases, the frequency inverter ignores the request
and does not send a reply:
• on receiving a broadcast request.
• if the request contains a transmission error.
• If the slave address in the request does not match that of the
frequency inverter.
• With an invalid data length,
(e.g. reading of 12 registers) error message F08 is triggered in
the MMX.
• With a CRC or parity error.
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 3.5.
characters.
Exception code Meaning Description
01 Illegal function This function is not supported.
02 Illegal data address The address was not found.
03 Illegal data value The data format is not permissible or is incorrect.
04 Slave device error Occurrence of a non-regenerative error while the slave attempted to execute
a slave response.
06 Slave device busy The slave has received the master request error-free. However, it is engaged
in processing a lengthy command.
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
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
h
The master must be programmed to repeat the request if
it does not receive a response within a specified time.

Eaton MMX34AA9D0 Series Specifications

General

Brand	Eaton
Model	MMX34AA9D0 Series
Category	DC Drives
Language	English