Real-Time Control Networks
Plasma and component control demand deterministic communication, so a real-time network moves sensor and command data on a fixed, guaranteed schedule.
Why real time
A vertical-stability loop that must act within milliseconds cannot tolerate unpredictable delays. Real-time control means the system responds within a guaranteed time bound every cycle, not just on average. The network that carries measurements to controllers and commands to actuators must therefore deliver data deterministically, with bounded latency and jitter.
Deterministic transport
General office networks deliver data eventually, not on a schedule. Real-time control uses deterministic transports, time-triggered or scheduled protocols, dedicated links, or reflective memory that mirrors data across nodes, so each controller has fresh inputs at a fixed cadence. The control cycle is clocked, and every node knows exactly when data arrives and when its output is due.
Architecture
Fast loops run on dedicated real-time controllers close to their hardware, with the tightest loops, like vertical stabilization, on the fastest cycles. Slower supervisory functions run on a higher layer. The network is layered to match: hard-real-time links for the fast loops, and more relaxed links for monitoring and logging, so heavy data traffic never delays a critical command.
- Guaranteed response within a fixed time bound
- Deterministic transport, not best-effort networking
- Fast loops on dedicated controllers, close to hardware
- Layered so logging never delays control
Synchronization and logging
A common time base synchronizes all nodes so measurements and commands share one clock, essential for reconstructing what happened and for coordinating multivariable loops. Every cycle is logged for analysis and for post-fault review. In the Kronos control architecture, described as a design and simulation model, the real-time network is the nervous system connecting diagnostics, controllers, and actuators across the plant.
Determinism, not raw speed, is what makes a control network trustworthy.