Instruction Manual

5. Modbus RTU
95
Modbus
5.3.14 Controller Status Signal Reading 4 <<STAT>>
(1) Function
This bit reads the internal operation status of the controller.
[Refer to 4.3.2 (15), “Data of system status register.”]
(2) Query format
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Register reading
Start address [H] 2 9008 System status register
Number of registers [H]
2
0002 Reading addresses 9008
H
to
9009
H
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 8
(3) Response format
A response message contains 16 bits of data per register.
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Internal status of controller
Number of data bytes [H] 1 04 Reading 2 registers = 4 bytes
Data [H] 4 System status System status [Hex]
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 9