As control devices operate continuously and production line throughput increases, the strain on the electronics grows as well. Many facilities focus on machine availability but overlook the operating conditions of the control modules. Yet, temperature can alter the behavior of PLC systems and network communications in ways that are not immediately apparent: initially, isolated packets are lost; subsequently, vague errors emerge; and ultimately, the process comes to a halt.
Temperature and PLC Stability
Industrial controllers are designed to operate in demanding environments, yet each has specific thermal limits. As temperatures inside the control cabinet rise, the devices react in various ways: signaling communication errors, interrupting cycles, performing unplanned restarts, or experiencing instability in data logging. The heavier the load on the I/O system, the more rapidly temperature affects processor clock speeds and the behavior of communication modules.
In many facilities, temperature rise is not caused by the operation of the controller itself, but rather by the high density of equipment, a lack of air circulation, or proximity to heat sources. For this reason, closed-loop cooling systems are implemented to maintain conditions conducive to the stable operation of the electronics. SMARTqube employs solutions that ensure consistent performance parameters, thereby reducing the number of unplanned maintenance tasks.
Temperature and industrial network stability
Industrial networks, whether based on Ethernet, Profinet, or serial communication—are sensitive to temperature fluctuations. Elevated temperatures affect the performance of switches, optical modules, cables, and connectors. Consequently, transmission latency increases, and the physical layer begins to operate less predictably. If even a single module in a cabinet exceeds its operating limits, the entire communication line can become unstable.
The most commonly observed consequences of overheating are:
· Degradation of signal quality in cables and connectors
· Transmission interruptions or brief losses of communication
In environments characterized by high dust levels or the presence of oil mist, there is an additional risk of contaminant buildup, which acts as thermal insulation and impairs equipment operation. Consequently, when designing new installations or upgrading existing systems, cooling methods are selected that prevent the accumulation of contaminants on sensitive components.
The importance of controlled environmental conditions
Both PLCs and network devices are affected by temperature in a cumulative manner. The first week of operation at elevated temperatures shows no symptoms, yet after several months, issues arise that are difficult to diagnose. Maintaining a stable environment requires a closed-loop cooling system that shields the electronics from external conditions. SMARTqube implements such solutions in locations where standard ventilation is no longer sufficient and constant parameter monitoring is required.