24
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 Name
Descriptions
01
Illegal Function
The message function received is not allowable
action.
02
Illegal Data Address
The address referenced in the data field is not valid.
03
Illegal Data Value
The value referenced at the addressed device
location is no within range.
04 Slave
Device
Failure
An unrecoverable error occurred while the slave
was attempting to perform the requested action.
05 Acknowledge
The slave has accepted the request and processing
it, but a long duration of time will be required to do
so.
06 Slave
Device
Busy
The slave is engaged in processing a long-duration
program command.
07 Negative
Acknowledge The slave cannot perform the program function
received in the query.
08
Memory Parity Error
The slave attempted to read extended memory, but
detected a parity error in the memory.
5.2
JetI/O 6510 Modbus/TCP Address Mapping
JetI/O 6510 Common Register Map (Holding Registers)
Protocol
Address
(Hex)
PLC
Address
(Decimal)
Access
Description
0000
40001
R/W
(Read/Write) Watch-dog enable/disable
R/W:AABB
AABB:0000H
(disable)
AABB:FF00H
(enable)
0001 40002
R/W
(Read/Write) Watch-dog cycle count
R/W:AABB
AABB:0001H~00FFH
(0.1*AABB)=Cycle Time (sec)
0002 40003
R/W
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)
0003
40004
R
Read the firmware version
R:AAAA
AAAA:F12A (HEX)
