Tweet seems to be deleted now. A brief summary of what it was:
* In Factorio (game) you can have space stations that send supplies to your ground base
* If the supplies are not caught, then they cause damage to your base
* To avoid sending supplies that cannot be caught, you can use logic controls
* A common approach is to have the station say "if (ground supply < X) send"
* This fails if the ground supply loses power, as no signal is interpreted as 0 and 0 < X
* Thus, the system will appear to work until your ground base loses power, at which point it will be destroyed
* A better system is to have the ground base use logic to say "if supply < X send signal" and the station to say "if signal received, send". This way, a power failure fails safe instead of fails active.
That's also easier way to design it in Factorio. When I was playing with Space exploration mod that's precisely what I did, the base sent "shopping list" and the provider sent stuff on that shopping list
* In Factorio (game) you can have space stations that send supplies to your ground base
* If the supplies are not caught, then they cause damage to your base
* To avoid sending supplies that cannot be caught, you can use logic controls
* A common approach is to have the station say "if (ground supply < X) send"
* This fails if the ground supply loses power, as no signal is interpreted as 0 and 0 < X
* Thus, the system will appear to work until your ground base loses power, at which point it will be destroyed
* A better system is to have the ground base use logic to say "if supply < X send signal" and the station to say "if signal received, send". This way, a power failure fails safe instead of fails active.
With a fun callout to https://en.wikipedia.org/wiki/The_Moon_Is_a_Harsh_Mistress