Sending a heartbeat signal Forum Home › Forums › Understanding the Software › Using Formulas › Sending a heartbeat signal Tagged: command, formula, heartbeat, output channel This topic contains 3 replies, has 2 voices, and was last updated by Mikhail 1 year, 8 months ago. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts November 9, 2017 at 4:33 pm #2785 hybridParticipant Hi there, I’ve got an command set up for a modbus device. I can manually execute the command successfully. It is a heartbeat signal that must change from 0 to 1 every second for communication to work. How can I automate the command to constantly execute ( write 0/1 to modbus register). I do not want to have to initiate the heartbeat signal if possible, but always have it running in the background. November 9, 2017 at 7:10 pm #2789 MikhailModerator Hi, You should create an input channel that changes every second, for example: DateTime.Now.Second % 2 and use Automatic Control Module with on change trigger to send a command. November 13, 2017 at 11:06 am #2802 hybridParticipant Thanks for reply. So is there no option to do this without purchasing the control module ? November 13, 2017 at 1:18 pm #2805 MikhailModerator Create your own simple module. Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.