Korenix JetI/O 6510 User Manual page 27

5.1.4 Exception Response
If an error occurs, the slave sends an exception response message to master consisting of
the slave address, function code, exception response code and error check field. In an
exception response, the slave sets the high-order bit (MSB) of the response function code
to one. The exception response codes are listed below.
Code
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
04 Slave Device Failure
05 Acknowledge
06 Slave Device Busy
07 Negative Acknowledge
08 Memory Parity Error
5.2 JetI/O 6510 Modbus/TCP Address Mapping
JetI/O 6510 Common Register Map (Holding Registers)
Protocol PLC
Address Address
(Hex) (Decimal)
0000 40001
0001 40002
0002 40003
0003 40004
Name
The message function received is not allowable
action.
The address referenced in the data field is not valid.
The value referenced at the addressed device
location is no within range.
An unrecoverable error occurred while the slave
was attempting to perform the requested action.
The slave has accepted the request and processing
it, but a long duration of time will be required to do
so.
The slave is engaged in processing a long-duration
program command.
The slave cannot perform the program function
received in the query.
The slave attempted to read extended memory, but
detected a parity error in the memory.
Access
R/W
R/W
R/W
R
Descriptions
Description
(Read/Write) Watch-dog enable/disable
R/W:AABB
AABB:0000H (disable)
AABB:FF00H (enable)
(Read/Write) Watch-dog cycle count
R/W:AABB
AABB:0001H~00FFH
(0.1*AABB)=Cycle Time (sec)
R: Read the host-watchdog status
W: Reset the host-watchdog status
R:AABB
AABB:0000H (remote module OK)
AABB:FF00H (host-watchdog fail)
W: AABB
AABB:FF00H(reset)
Read the firmware version
R:AAAA
AAAA:F12A (HEX)
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