Single Pair Ethernet: the cornerstone for the Smart Factory
The upgrade for the field level
Single-pair Ethernet cables are copper cables that contain just one twisted core pair (single pair) and are primarily intended for data transmission in industrial applications. Conventional Ethernet cables from the LAN sector or industrial Ethernet cables have two or four core pairs, depending on the data transmission rate. Single Pair Ethernet is a lean, lightweight and material-saving development of the industrial Ethernet. SPE enables a consistent and uniform network infrastructure right up to the field level. The Ethernet networking of the field devices, such as sensors and actuators, enables real-time data to be collected and analysed.
SPE replaces conventional fieldbuses
Industry 4.0 and the Industrial Internet of Things (IIoT) require a uniform network infrastructure across all levels and systems, as well as data transmission in real time.
The classic Ethernet, which already connects all upper layers in the automation pyramid, is often unsuitable for connecting the lowest field level because the cables are difficult to connect and are oversized. Therefore, conventional Fieldbuses currently have advantages over the Ethernet standard in these areas. They are the ones that regulate the exchange of information between sensors and actuators with the control level (PLC). These BUS systems are now to be replaced by SPE systems and corresponding SPE cables as soon as possible.
Advantages of Single Pair Ethernet
- Replacing fieldbuses for a future-proof smart factory
- Standardisation of technology in IP-based networks, from sensor to ERP and the cloud
- Material, weight and cost savings, significantly less space required
- Single-paired cable design for fast, easy installation and fewer errors during assembly
- Cost effectiveness through the elimination of gateways as "translators"
- Power-over-Data-Line for supplying terminal devices with up to 50 watts
- Open standard with compatible cabling components for universal use in the entire automation industry
What's next with SPE?
Standards ensure a quick entry into practice:
- The protocol standards according to IEEE 802.3 define the technical framework conditions for Single Pair Ethernet data transmissions in industrial applications.
- The industrial connector face "T1 Industrial Style" is standardised by IEC 63171-6.
The working group IEEE 802.3 has defined standards for different SPE applications.
| SPE standard | Bit rate | Cable length point to point | Cable length point to point |
|---|---|---|---|
| shielded | unshielded | ||
| IEEE 802.3ch | 2.5/5/10 Gbit/s | 15m (49.22 ft) | - |
| IEEE 802.3bp | 1 Gibt/s | 40 m (131.24 ft) | 15 m (49.22 ft) |
| IEEE 802.3bw | 100 Mbit/s | 40 m (131.24 ft) | 15 m (49.22 ft) |
| IEEE 802.3cg | 10 Mbit/s | 1000 m (3281 ft) and more | - |
LAPP is a member of the SPE Industrial Partner Network, a consortium of well-known companies that want to help SPE technology break through together.
The network of partners aims to create an integrated SPE infrastructure. The innovative technology should not only guarantee reliable data transmissions, but also provide standardised interfaces and system components. The foundation for this has already been laid by defining standards and working closely with international standards committees.
Ethernet Advanced Physical Layer: SPE for the process industry
Ethernet APL is the booster for networking at field level – especially for the process industry. Single Pair Ethernet with its consistent networking using one protocol is used as the basis. Ethernet APL extends this to include intrinsic safety for areas at risk of explosion with all the benefits of SPE.
LAPP offers a comprehensive portfolio for setting up Ethernet-APL networks with Single Pair Ethernet cables.