How to use logic functions to control the boiler call for heat in an Eelectron KNX PWM based UFH control system

How to use logic functions to control the boiler call for heat in an Eelectron KNX PWM based UFH control system

If you want an ON if any PWM based valve is more than 1% and OFF if all are set to 0% you can implement that with 3 simple logic functions by setting all in an OR between each other.

This is an example where there are 8 PWM zones, and I'm using:
  • one logic block for the first 4
  • a second logic block for the next 4
  • a third logic block comparing logic blocks 1 and 2 to have a final outcome

First logic, setting in OR for  first 4 PWM zones


Second logic, setting in OR for next other 4 PWM zones


Third logic, this will made an OR between the first logic block and the second one. 

Communication objects will be set as follow