what‘s the Structure of memory?

what‘s the Structure of memory?It includes flash and NVRAM and else?

When the program runs,it runs in NVRAM?

I notice that in the manual ,it reference “the precedence on boot-up is (1) NVRAM, (2) Flash, (3) zero.”

What’ the meaning of zero?

That explanation applies only to the variables. The preceding sentence explains it. See end of topic: http://www.deltamotion.com/support/webhelp/rmctools/Programming/Variables/Variables.htm

For the RMC memory, the program is in RAM. It is stored in Flash. When the RMC starts, the Flash memory is copied to RAM.