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Serial Communications Section 6-1
Error Codes The following error codes are stored in an allocated DM Area word when an
error occurs in Modbus-RTU Easy Master function execution.
Auxiliary Area Flags
and Bits
The Modbus-RTU command set in the DM fixed allocation words for the Mod-
bus-RTU Easy Master is automatically sent when the Modbus-RTU Master
Execution Bit is turned ON. The results (normal or error) will be given in corre-
sponding flags.
Code Name Description
0x00 Normal end Not an error.
0x01 Illegal address The slave address specified in the parameter
is illegal (248 or higher).
0x02 Illegal function code The function code specified in the parameter is
illegal.
0x03 Data length overflow There are more than 94 data bytes.
0x04 Serial communica-
tions mode error
The Modbus-RTU Easy Master function was
executed when the serial communications
mode was not the Serial Gateway Mode.
0x80 Response timeout A response was not received from the Servo.
0x81 Parity error A parity error occurred.
0x82 Framing error A framing error occurred.
0x83 Overrun error An overrun error occurred.
0x84 CRC error A CRC error occurred.
0x85 Incorrect confirmation
address
The slave address in the response is differ-
ence from the one in the request.
0x86 Incorrect confirmation
function code
The function code in the response is difference
from the one in the request.
0x87 Response size over-
flow
The response frame is larger than the storage
area (92 bytes).
0x88 Exception response An exception response was received from the
slave.
0x89 Service being exe-
cuted
A service is already being executed (reception
traffic congestion).
0x8A Execution canceled Executing the service has been canceled.
0x8f Other error Other FINS response code was received.
Word Bit Port Contents
A640 00 Port 2 Modbus-RTU Master Execution Bit
Turned ON: Execution started
ON: Execution in progress.
OFF: Not executed or execution completed.
01 Modbus-RTU Master Execution Normal Flag
ON: Execution normal.
OFF: Execution error or still in progress.
02 Modbus-RTU Master Execution Error Flag
ON: Execution error.
OFF: Execution normal or still in progress.
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