【PLC based on the Internet of Things】---Purely handmade PLC controller

cpsiot

【PLC based on the Internet of Things】---Purely handmade PLC controller [Copy link]

 

Since this PLC involves many components, it took a lot of effort to collect all the components and modules. Thanks to my friends for providing some connectors and module samples.

PLC housing

After rummaging through boxes and drawers, I finally found the SANHE instrument case that I had treasured ten years ago. After some processing, it looks pretty good.

Referring to the interface diagram of the Raspberry Pi, I drew a panel punch diagram:

Start drilling:

Just use a utility knife to trim the corners:

Soldering station ready:

Soldering panel OLED:

Use a hot melt gun to fix the OLED display to the corresponding position of the panel:

In order to make the panel look better, green paper and transparent tape were used to make a green panel.

Baseboard PCBA production

Use a saw blade to process the PCB breadboard into the appropriate size for the bottom shell, and use an electric drill to slot the studs at both ends. Insert the European pins.

Solder the top components:

Soldering the back components and power module:

Interface board PCBA production:

Solder the front connector, insert other modules on the interface board, and solder them in order from short to tall:

Follow the principle of horizontal and vertical, which is convenient for later inspection. The short-circuit wire is connected with the metal wire inside the signal line. Be careful, otherwise you will have to rework it later.

Finished product assembly:

Plug the Raspberry Pi into the interface board:

Here is a detail that requires adding a fixed column:

Insert the base plate:

Install the shell. There is a small detail here. The yellow studs need to be cut off because there is a bottom board PCBA with a power module:

Insert the panel OLED display:

Mission accomplished!

lugl4313820

This welder is OK!

cpsiot

lugl4313820 posted on 2022-7-29 05:55 This welder is good!

bigbat

What software does the host use for the system? What programming language does the PLC use, ladder diagram, assembly or some other language?

cpsiot

The system uses a domestic industrial Internet of Things operating system, which can be understood as the integration of the functions of the Internet of Things and PLC. Programming is implemented using function blocks based on the 61131-3 international standard.

bigbat

Is the original post based on the PLCopen project? I have been familiar with the Runtiome MCU porting of this project for a while.

bigbat

I hope the host can share more