Alternate switching of 5 relays. After each lap of relay switching, there is a situation when all relays are disconnected. Pulse OFF PULSE turns off the relay immediately. The next impulse turns it on again.
To use the nodes in your project you should have the seralex/selector-input-5-relay library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.