Ethernet Advanced Physical Layer (Ethernet APL) is the new intrinsically safe 2-wire solution for Ethernet, based on IEEE and IEC standards. It enables process plants to be continuously networked and digitialized, from the devices in the field to the control room. Ethernet APL supports the intrinsic safety type of protection ‘i’ and thus enables the operation of field devices in potentially explosive atmospheres up to Zone 0.

The Ethernet-APL field switch is the central component in the Ethernet-APL network of every process plant. R. STAHL offers particularly robust and durable field switches specifically for field use, which offer the following advantages:

• Installation directly on site in the field in Zone 1 or 2
• Ideal for harsh environmental conditions such as -40…+70 °C in any mounting position
• Intrinsically safe power supply for APL field devices down to Zone 0
• Comprehensive integrated network and physical layer diagnostics via PROFINET and FDI
• Integrated local display for on-site support during commissioning and troubleshooting
• Built-in Ethernet traffic management for a virtually unlimited number of field devices
• Optional use of fibre optic cables for distances of several kilometres

In addition to the new Ethernet-APL field devices, PROFIBUS PA field devices can also be easily connected to PROFINET using the integrated PA proxy – both in profile modes 3.02 and 4 and with the manufacturer-specific GSD. In combination with our IS1+ remote I/O system, all generations of 4...20 mA field devices, simple digital sensors and actuators, HART devices, fieldbus and Ethernet-APL can be used in a modern Ethernet network with PROFINET.

In addition to innovative Ethernet-APL field switches, R. STAHL also offers the appropriate installation technology for Zone 2 and Zone 1. This means that the Field Switches can be installed individually, in groups or in combination with remote I/O anywhere. Depending on the shielding concept, we offer various options, both capacitive and direct – tailor-made for your new digital system.