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The internal error register area is used if Modbus error code 0x04 occurs. The registers
contain information about the last query. You can figure out the reason of the failure
by reading the registers. The internal error register is cleared when a query has finished
successfully.
Address
(4)00090
(4)00091
(4)00092
(4)00093
(4)00094
(4)00095
Error code
0x00
0x02
0x03
0x05
0x65
0x66
0x70
0x71
0x72
0x73
0x74
Registers (16-bit word)
Reset internal error registers (0 = Do nothing, 1 = Reset)
Function code of the failed query
Internal error code; see the error number.
Failed register
Last register that was written successfully
Last register that was read successfully
Description
No error
Low or high limit exceeded
Faulty subindex
Incorrect data type
General error in drive communica-
tion
Timeout
Read-only
Parameter group ended
MSB is not zero
LSB query start
MSB query end
Modbus/TCP – Diagnostics 57
Situation
Used when a Modbus query was success-
ful
Change access with a value outside the
value limits
Access to an unavailable subindex of an
array parameter
Change access with a value that does not
match the data type of the parameter
Undefined error when handling a Modbus
query
Timeout in drive communication when
handling a Modbus query
An attempt to write a non-zero value to
a read-only drive parameter
An attempt to write to multiple paramet-
er groups
An attempt to write a 16-bit parameter
with a 32-register address and the MSB
bytes are not zero
An attempt to access only the LSB re-
gister of the 32-bit parameter
An attempt to access only the MSB re-
gister of the 32-bit parameter
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