Contec CONPROSYS nano CPSN-PCB271-S1-041, Reference Manual, Page: 102 / 155

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Programing with CODESYS
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CPSN-PCB271-S1-041 Reference Manual (Software)
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6. Create and build a program
This section describes how to create sample that performs 2-bit digital input / output from Modbus
Master.
In this program, the digital output data is copied from the Modbus variable to the I/O variable, and
the digital input data is copied from the I/O variable to the Modbus variable.

Create a Program
1
Double click the [PLC_PRG (PRG)] icon on the device window to open the “ST editor window”.
2
Write the following source code in “Program” under “ST editor window”.
DO0 := mDO0;
DO1 := mDO1;
mDI0 := DI0;
mDI1 := DI1;
3
Now, see whether you can execute [Rebuild”] in CODESYS [Build] menu to confirm the process
succeeds.
7. Download and run program
1
Select [Online] - [Login] on CODESYS menu.
2
Click [Yes] in the download confirmation dialog.
3
Select [Debug] – [Start] and the program operation will start.