Useful Commands

The following commands are useful when working with the PLC Shift runtime. Almost all systems will use the Systemd init system. Opto 22 PR1 and PR2 devices use SysV init. These commands require root access (super user credentials) and cannot be used with containerized solutions like on the Sensia HCC2.

Stop the Runtime

systemd: sudo systemctl stop plc-shift-app.service

sysV: sudo /etc/init.d/plc-shift-app stop

Start the Runtime

systemd: sudo systemctl start plc-shift-app.service

sysV: sudo /etc/init.d/plc-shift-app start

Restart the runtime

systemd: sudo systemctl restart plc-shift-app.service

sysV: sudo /etc/init.d/plc-shift-app restart

	Stopping the runtime only stops it until the computer is rebooted. When the computer starts, the application will also be started.

View Live Log Files

This can only be done on systems that use Systemd. Additional details are in the Log Files section.

sudo journalctl -f -u plc-shift-app.service

Check the Installed Version

The PLC Shift runtime installation has a text file in it that has the details of the currently installed executable, including the version and compile time (UTC). To view this file, type:

sudo cat /usr/share/plc-shift/version.txt