3 ms·
Sure, you can do it with a couple of analog electrical wires running from each valve and gauge to a central computer... You still have a computer and software (
by liotier 9y ago
Sure, you can do it with a couple of analog electrical wires running from each valve and gauge to a central computer... You still have a computer and software (and a thick cable routing mess) and you only took some network protocol out of the attack surface (and you still need one to connect the workstations...)
- raverbashing 9y agoYou don't need to control everything centrally, you can compartmentalize your control (and also enforce limits) Don't bring a thermal overrun detection to the central computer and have it shutdown a burner. Do this locally
- liotier 9y agoI found the name for that concept: https://en.wikipedia.org/wiki/Subsumption_architecture https://en.wikipedia.org/wiki/Subsumption_architecture - subsumption architecture puts some of the intelligence in the lower level systems. While the higher level controls can tell the lower level systems what it wants, it can't do things that the lower system determines is dangerous.
- semi-extrinsic 9y agoTypically all these are on Modbus or similar though. Only the SCADA controller itself is on ethernet (in addition to modbus).