SSR control in XOD

how to pulse a SSR relay and control pulse rate

Since you don’t provide any details of how you want the relay pulsed, there are probably an infinite number of answers with no way of knowing what is best for your application. The simplest solution would be a steady pulse:

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Starting from the bottom, the relay node controls the physical relay via the pin# specified on relay-PORT. In this case, it will only activate the relay when the delay node is active. The delay node is activated every second (clock-IVAL) by the clock node and stays active for 0.1 seconds (delay-T).