The remote I/O system “IS1+” from R. Stahl meets the current requirements of the process industry. It ensures fast and secure data transmission even in hazardous areas of Zone 1 with end-to-end digital access to all process and asset management-relevant data from sensors and actuators. The system also enables integration via digital high-speed Ethernet networks with modern real-time protocols such as Profinet.
Remote I/O system as the first Ex-certified solution for 100Base-TX-IS
The remote I/O system for Zone 1 uses intrinsically safe communication interfaces for this purpose. This means that extensions, conversions or maintenance work can be carried out during operation, even in potentially explosive atmospheres, without the need for complex approvals or even shutdowns. The connection of Profibus DP and Modbus RTU is still based on the intrinsically safe RS485-IS standard. For the Ethernet protocols Profinet, Ethernet/IP, Modbus TCP, Hart-IP and OPC UA, “IS1+” uses the new standardized Ex i version for 4-wire Ethernet with 100 Mbit/s: 100Base-TX-IS. The specification was developed by a consortium a few years ago. With “IS1+”, the first Ex-certified solution is now available. This allows remote I/O systems to be networked via inexpensive standard Cat cables and industrial RJ45 connectors and operated on an intrinsically safe Ethernet network in Zone 1.
Up to two kilometers of multimode or 30 kilometers of singlemode cable in use
The Ex i isolation stage required for intrinsically safe circuits or networks is also available in the form of a 9723 media converter. In order to overcome the length restriction of 100 meters for copper-based 100 Mbit/s Ethernet, the 9723 media converter converts the intrinsically safe 100Base-TX-IS to 100Base-FX fibre optic cables. Depending on the variant used, up to two kilometers with multimode cables and approx. 30 kilometers with singlemode cables are possible. The media converter is certified for installation in Zone 1. It can also be integrated into the “IS1+” field stations on site, for example.
In order to also be able to use the flexibility of intrinsic safety in Zone 1 on the fiber optic side, the fiber optic interface complies with the specification for Class 1 lasers in accordance with DIN EN 60825-1. This means that this interface does not require a certified type of protection “op is” in accordance with DIN EN 60079-28 “Protection of equipment and transmission systems using optical radiation”. Plugging and unplugging the fiber optic cable during operation in Zone 1 is permitted at any time, provided the remote station also complies with Class 1 or “op is”. The 9723 media converter operates completely transparently. No configuration or parameterization is required. All that is required is an auxiliary power supply of 24 volts DC, 120 to 230 volts AC are in preparation.
Function package for remote I/O system with intrinsically safe Ethernet connection and up to 16 connectable I/O modules
The remote I/O function package for Zone 1 includes an intrinsically safe Ethernet connection and up to 16 connectable I/O modules. There is also multi-protocol support including OPC UA and Hart-IP as well as an extended temperature range of minus 40 to plus 75 degrees Celsius. According to the manufacturer, this makes the remote I/O system the most powerful solution currently available for integrating conventional sensors and actuators into digital networks. In combination with the new Ethernet APL field switches from R. Stahl, users have a comprehensive solution platform for their digitalization projects in hazardous areas.
