OpenPLC-on-SL-AIoT-BOX-SpaceSOM-8Mplus

OpenPLC on SL-AIoT-BOX with SpaceSOM-8Mplus

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OpenPLC runtime

The default Debian Flexbuild system image for SL-AIoT-BOX with SpaceSOM-8Mplus has OpenPLC runtime installed and enabled (https://autonomylogic.com/docs/openplc-overview/). After running the system, the OpenPLC webserver can be accessed using the network name or IP address with 8080 port:

• http://somlabs-aiot-box-8mplus:8080
• <IP address>:8080

The IP address can be checked after logging to the serial console as root (no password) and calling ip a command.

The default webserver login credentials are:

• username: openplc
• password: openplc

Setting hardware

OpenPLC requires correct hardware driver to support hardware inputs and outputs. The driver for the SL-AIoT-BOX is called SoMLabs IoT Box and should be selected in Hardware window. After clicking Save changes the driver will be compiled.

SL-IoT-BOX has six binary outputs and four binary inputs configured for OpenPLC programs. They are mapped as follows:

OpenPLC address	GPIO	Connector	Function
%IX0.0	GPIO1_IO4	J7A_2	Digital input
%IX0.1	GPIO1_IO05	J7A_3	Digital input
%IX0.2	GPIO1_IO6	J7A_4	Digital input
%IX0.3	GPIO1_IO7	J7A_5	Digital input
%QX0.0	GPIO1_IO08	J7B_2	Digital output
%QX0.1	GPIO1_IO09	J7B_3	Digital output
%QX0.2	GPIO1_IO10	J7B_4	Digital output
%QX0.3	GPIO1_IO11	J7B_5	Digital output
%QX0.4	GPIO1_IO00	J7D_7-9	Relay output
%QX0.5	GPIO1_IO01	J7D_10-12	Relay output

Demo application

OpenPLC runtime executes programs built using OpenPLC IDE (https://autonomylogic.com/). The example project and pre-compiled program can be downloaded here: Openplc_demo.zip

This example uses all four binary inputs to control binary outputs and two relays as shown on the project scheme.

It can be uploaded to SL-AIoT-BOX OpenPLC runtime in the Programs window:

After compilation the project can be run using the Start PLC button in Dashboard window

The program autostart after system boot can be enabled in the Settings window