Instruction Manual

5. Modbus RTU
105
Modbus
5.3.19 Special Input Port Input Signal Status Reading<<SIPM>>
(1) Function
This bit reads the status of input ports other than the normal input port.
[Refer to 4.3.2 (16), “Data of special input port monitor registers” for the data input via the special
input port.]
(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 9012 Special input port monitor
Number of registers [H] 2 0001 Reading addresses 9012
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 Register reading
Number of data bytes [H] 1 02 Reading 1 register = 2 bytes
Data [H] 2 Special port monitor Refer to 4.3.2 (16), “List table.”
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 7