Advantech ADAM-6050 18-Channel Isolated Digital I/O Modbus TCP Module ADAM-6050-BE Scheda Tecnica

To fullfill the programming requirement, there is a series of function code 
standard for users reference¦

Code (Hex)  Name

Usage 

01

Read Coil Status

Read Discrete Output Bit 

02

Read Input Status

Read Discrete Input Bit

03

Read Holding Registers

04       

Read Input Registers 

Read 16-bit register. 
Used to read integer or floating
point process data. 

05

Force Single Coil

Write data to force coil On/Off

06

Preset Single Register

Write data in 16-bit format

08

Loopback Diagnosis

Diagnostic testing of the 
communication port 

15

Force Multiple Coils

Write multiple data to force coil
On/Off

16

Preset Multiple Registers   Write data in 16-bit format

Function Code 01 
The function code 01 is used to read the discrete outputs ON/OFF status 
of ADAM-6000 modules in a binary data format.
Request message format for function code 01:

  
Example: Read coil number 1 to 8 (address number 00017 to 00024) from 
ADAM-6000 Modules
         01 01 00 17 00 08

                                                 Command Body

Station 

Address

Function 

Code

Start 

Address 

High Byte

Start 

Address 

Low Byte

Requested 

Number of Coil 

High Byte

Requested 

Number  of 

Coil Low Byte