A modern production line is not controlled by the PLC alone. Sensors, servo drives, remote I/O, machine vision cameras, PLCs, SCADA systems, and MES platforms all exchange data through the factory network. A sensor sends a status signal, a PLC processes it, SCADA displays the operating condition, and MES uses production data for scheduling and traceability.

This sounds straightforward until communication becomes unstable. A PLC may lose contact with a device, a ring network may take too long to recover, or large amounts of machine vision data may compete with control traffic. The result can be anything from delayed data to a production line stoppage. This is where an industrial switch becomes more than a simple network device.

Industrial Switches Sit Between Different Automation Layers

Industrial networks usually have several layers, and each one has different communication requirements.

At the equipment level, sensors, PLCs, servo drives, I/O modules, and other field devices need reliable network access. For many of these connections, 100Mbps 5-port or 8-port industrial switches are sufficient. When the network includes machine vision, industrial cameras, or other high-volume data applications, Gigabit 5-port or 8-port industrial switches are more suitable.

The next layer is the PLC control network. Here, the priority is not simply transmission speed. Stable communication, network recovery, and traffic management become more important because PLC communication is directly related to machine operation.

Above the control layer, industrial switches aggregate multiple production lines and connect them with SCADA, HMI, or DCS systems. Operators can then monitor equipment status, receive alarms, and manage production information from a centralized interface.

The network continues upward to the MES layer. MES connects production plans with actual manufacturing activities, so information needs to move between PLCs, production equipment, WMS/WCS systems, AGVs, and the MES platform. Further upstream, production data can be exchanged with ERP and SCM systems.

In simple terms, the network may look like this:

Sensors & Devices → PLC → SCADA/HMI/DCS → MES → ERP/SCM

The industrial switch is one of the key connection points that keeps this data moving.

Why 100Mbps and Gigabit Industrial Switches Both Matter

There is no need to use Gigabit everywhere simply because Gigabit is faster. A large number of field devices generate relatively small amounts of data. Sensors, PLC interfaces, meters, and I/O devices may not require high bandwidth, making 100Mbps industrial switches a practical choice for local access.

Machine vision is different. A camera can generate much more data than a conventional sensor, particularly when multiple cameras operate at the same time. In such cases, Gigabit Ethernet provides more bandwidth for image and inspection data.

This is why 5-port and 8-port industrial switches are commonly used in automation projects. They offer a compact way to connect local equipment without unnecessarily increasing network complexity or cost.

The important question is not "Which switch is faster?" but rather "What does this part of the network actually need to transmit?"

What Makes an Industrial Switch Different?

An industrial switch is not simply a regular Ethernet switch with a metal enclosure.

Production environments can expose network equipment to temperature changes, vibration, electrical interference, unstable power conditions, and continuous operation. A switch installed inside a control cabinet or close to production equipment needs to maintain reliable communication under these conditions.

Network redundancy can also become important in production lines. If a single communication link fails, a properly designed ring network can provide an alternative path and help restore communication without requiring operators to manually reconnect equipment.

For this reason, industrial switch selection should consider more than port count and bandwidth. Environmental adaptability, power design, electromagnetic compatibility, network redundancy, and long-term stability all matter when the switch is part of a PLC or production-line network.

Where Does Yuhang Optics Fit In?

For many automation projects, the requirement is not an oversized core switch. It is a reliable access switch that can be installed close to the equipment and integrated into the existing control network. The Yuhang Optics DS Automation Professional Series is designed around these common industrial networking requirements. Its 5-port and 8-port industrial switch configurations can be used for equipment access, PLC control networks, and production-line communication.

The right model still depends on the application. A small equipment cell may only need a compact 100Mbps switch, while a machine vision system or a higher-traffic production network may benefit from Gigabit connectivity.

The Switch Is Small, but the Network Is Not

An industrial switch may only occupy a small space in a control cabinet, but it can sit between equipment that must communicate continuously throughout a production cycle.

From a sensor signal reaching a PLC to production information reaching MES, every layer depends on reliable network connections. Choosing an industrial switch should therefore start with the actual devices, traffic patterns, network architecture, and operating environment—not simply the number printed on the product specification sheet. For this reason, the role of an industrial switch is easy to underestimate. It does not control the machine, manage production schedules, or ｒｅｐｌａｃｅ the MES. It provides the communication infrastructure that allows these systems to work together.