Scaling Hot-Run Controller: How the Number of Runs and System Integration Interact
A tooling inventory rarely changes according to plan. New tools come with more cavities, existing systems are expanded, and production lines grow over the years. A hot runner controller designed for only a fixed number of runners quickly becomes a limiting factor at this point.
This article examines two questions that are closely related in practice: How can the number of channels be scaled flexibly, and how does the controller integrate into an existing automation environment?
Why Fixed Channel Numbers Become a Problem
When a controller is purchased for a specific number of channels, two scenarios typically arise:
- The system is expanding, and an additional, separate device is being added—with its own operating logic, its own login, and its own diagnostics.
- A new tool with a different number of zones requires a completely new control unit, even though the existing equipment would actually be sufficient.
Both of these factors increase the workload for operating personnel and maintenance staff without providing any technical added value. A more sensible approach is a system that can be expanded modularly while retaining a consistent user interface.
Integration Instead of New Purchases
The THERMONOM 2G solves this problem using a pairing function in the device settings. Multiple devices can be connected to a single control unit—ranging from the basic models with 6 or 12 channels to the largest version with 54 or 60 channels, for a total of up to 192 channels.
In practical terms, this means the following for the business:
- A user interface for all paired devices, regardless of the total number of channels.
- Monitor views with 24, 36, 48, 60, or 96 channels for a compact overview during shift operations.
- Full compatibility even between different sizes and even different generations of devices—a first-generation THERMONOM can be combined with the current THERMONOM 2G.
This reduces the pressure to invest in expansions: An existing system grows along with the business instead of being replaced.
Integration into the existing automation infrastructure
Scalability at the channel level is only one aspect. The second is integration with higher-level systems—PLCs, control systems, MES, or the injection molding machine itself.
Overview of Relevant Interfaces:
Machine connectivity. The controller can be integrated directly into the injection molding machine’s control system via RS232, RS485, or CAN, including a serial connection for common machine control systems.
Network integration. Ethernet-based protocols such as Modbus TCP and OPC UA enable integration into existing control systems, including optional encryption.
Digital I/O. Simple signals such as On/Off, Standby, or Boost can be controlled via potential-free inputs and outputs independently of a fieldbus—useful for simpler control requirements or as a fallback option.
Future Standards. Euromap 82.8 provides support for yet another interface standard relevant to the plastics industry.
In practice, this versatility means that the controller adapts to the existing automation architecture rather than forcing a standalone solution.
What this means for planning
When selecting a hot-runner controller, it is therefore worth looking beyond your current needs:
- How many channels are needed today—and how many in two to three years?
- Can the system be expanded without disrupting operations, or is it likely that multiple standalone solutions will have to run in parallel as the system grows?
- Which interfaces are already in use in the existing control system, and does the controller support them natively?
Those who answer these questions early on can avoid a situation where a solution that seemed sensible at first reaches its limits after the first expansion.
Conclusion
Scalability in hot-runner controllers is evident not only in the maximum number of runners, but also in how seamlessly a system can be expanded and integrated into existing automation structures. Interoperability and open interfaces are the two factors that determine the long-term protection of your investment.
