Managed vs Unmanaged Industrial Ethernet Switches: A Buyer's Guide

Industrial vs office switches

An office switch is built for a climate-controlled room. An industrial switch is built for DIN-rail or panel mounting, extended temperature ranges, vibration, electrical noise and redundant power inputs. Using consumer-grade equipment in a control cabinet is a false economy: failure rates are higher and the diagnostic tools plant staff need are missing.

Unmanaged switches: simple and affordable

An unmanaged switch forwards traffic with no configuration. It is plug-and-play, inexpensive and perfectly adequate for small, isolated networks such as a single machine with a PLC, HMI and a few devices, where nobody needs to monitor or segment traffic.

Maisvch offers compact options in this category, for example the MES series embedded industrial switches, and you can see the wider range on the Maisvch brand page.

Managed switches: control, visibility and resilience

A managed switch can be configured, monitored and secured. The features that matter most in a plant are:

• Redundancy protocols such as RSTP or faster proprietary ring protocols, so a cable or switch failure does not stop communication.
• VLANs to separate control traffic, vision, voice and guest or maintenance access on the same hardware.
• Quality of service (QoS) to prioritise time-critical control traffic over bulk data.
• Port security, access control lists and disabling of unused ports to reduce attack surface.
• Diagnostics such as SNMP, port mirroring, alarms and event logs, so you can find problems before operators do.
• Multicast handling (IGMP snooping), which is essential for protocols such as EtherNet/IP and PROFINET.

Westermo's Lynx series of layer 2 managed switches, running the WeOS network operating system, is a typical choice for machine and cell-level networks, while the RedFox series is designed for the core of large, high-performance industrial networks. Browse the full range on the Westermo brand page.

How redundancy works

The classic design is a ring: each switch connects to two neighbours, so if one link fails the traffic takes the other way around. Standard Rapid Spanning Tree Protocol (RSTP, IEEE 802.1w) provides this, and vendors also offer faster ring protocols, such as Westermo's FRNT, that restore communication quickly enough for demanding control applications.

For applications that cannot tolerate any switchover time, IEC 62439-3 protocols such as PRP and HSR send traffic over two independent paths simultaneously. Whatever you choose, test the failover: unplug a cable during commissioning and measure how long the process loses communication.

Routers, gateways and serial devices

Switches are only part of the picture. Routing between networks, remote access over cellular and bridging legacy serial equipment all appear in real plants. Westermo's Viper series, for instance, includes IEC 62443-4-2 SL2 certified routing switches optimised for railway rolling stock, a good example of security certification at the component level. See our full networking catalogue for routers, serial servers and media converters.

Cabling, fibre and power over Ethernet

Copper Ethernet is limited to 100 metres per segment. Beyond that, or where electrical isolation and immunity to interference matter, use fibre with SFP or fixed fibre ports. In vibration-prone environments such as rolling stock, vessels and heavy machinery, M12 connectors give a more secure connection than standard RJ45. If you power cameras, wireless access points or small devices over the network, specify Power over Ethernet (PoE) switches with enough power budget for every device on the switch, plus headroom.

Network design best practices

• Choose a topology deliberately: star for simplicity, ring for resilience, and a hierarchical design for large plants.
• Plan your IP addressing and VLAN scheme on paper before installing hardware.
• Keep control traffic, vision and corporate access on separate VLANs.
• Leave spare ports and spare rack space, networks always grow.
• Label cables and ports, and keep configuration backups for every managed switch.
• Synchronise time across devices so logs from different systems can be correlated.

Commissioning and testing

Before handover, test the network the way it will fail in real life. Unplug redundant links and measure recovery, power-cycle switches, check that VLANs isolate traffic as designed and verify that diagnostics and alarms reach the people who need them. Document the results; they become the baseline for future troubleshooting.

A short selection checklist

• Count ports now and add at least 20% spare for growth.
• Decide where fibre is needed for distance or electrical isolation.
• Confirm temperature range, mounting style and power input redundancy.
• Check PoE needs for cameras or wireless access points.
• Choose managed whenever the network is shared, plant-wide or business critical.
• Make sure your design supports the security zoning described in our guide to OT cyber security and IEC 62443.

Network design is an engineering task, not just a purchase. If you would like help designing, staging or commissioning an industrial network, get in touch with BEC Automation.

Frequently asked questions

Do I need a managed switch for a small machine network?

Not always. A single machine with a few devices and no remote access can run on an unmanaged switch. Choose managed when you need diagnostics, redundancy, VLANs or security controls.

What is the difference between layer 2 and layer 3 switches?

A layer 2 switch forwards traffic within a network based on MAC addresses. A layer 3 switch can also route between IP networks or VLANs, which is useful when you segment a plant network into zones.

How fast should ring redundancy recover?

It depends on the application. Standard RSTP can take from hundreds of milliseconds to seconds, while faster proprietary ring protocols and PRP/HSR are designed for much shorter recovery. Match the recovery time to what your process can tolerate.