Protocol gateways, also known as protocol converters or protocol translators, allow machines and networks that use different communication protocols to communicate with each other seamlessly. In this article, we'll explain why protocol gateways are necessary, how they work, and how they benefit industrial companies.
Introduction to protocol gateways
In the early days of networking, manufacturers created their own proprietary communication protocols to enable communication between their machines. As the number of connected devices increased, a standardized way of communication became essential, leading to the development of open, standardized protocols such as Modbus and PROFIBUS.
However, even with the development of open protocols, devices that used different communication protocols still could not communicate with each other. This is where protocol gateways became crucial. They serve as intermediaries between devices using different protocols, enabling seamless communication and interaction. Whether it is for overcoming communication barriers caused by proprietary or legacy protocols or for connecting devices running on open networks, protocol gateways play a critical role in facilitating communication between disparate systems.
What does a protocol gateway do?
A protocol gateway serves as a bridge between two networks that use different protocols. With over 150 open and proprietary networks available, there are many opportunities for connections.
Protocol gateways act as translators between machines and industrial data networks and can connect devices like robots, control systems, motors, and sensors to any industrial network.
“Gateways are sometimes only seen as the last resort to a connectivity problem, but maybe should be thought of as the first and most obvious choice for easily and quickly connecting devices or machines to different industrial networks.”
Protocols can be compared to languages because, like languages, they define rules and conventions for communication between systems or components. Just as people who speak different languages cannot communicate effectively without a translator, systems that use different protocols also require protocol translators to facilitate communication.
A protocol gateway performs this required translation, enabling communication between devices or systems that use different protocols. They receive data in one protocol and convert it into a format that the receiving system’s protocol can understand.
By providing a bridge between different protocols, gateways can reduce the complexity and cost of integrating systems, improve data exchange, and facilitate interoperability between different components.
Types of protocol gateways
Protocol gateways come in two main types, each with its own functionality:
The first type connects two different networks with different base protocols. For example, it can link PROFIBUS to EtherNet I/P, allowing devices on these networks to communicate with each other seamlessly.
The second type connects simpler devices, such as sensors and scales, to more complex networks. This type of gateway typically uses a simple connection, such as an integral serial interface, to link the device to the network. By acting as a translator between the device's protocol and the network's protocol, these gateways enable the devices to communicate with other devices on the network, even if they use different communication protocols.
Benefits of using a protocol gateway
Communication between devices
Protocol gateways enable devices to communicate with each other by translating messages sent between them from one protocol to another. This makes it possible for devices that use different protocols to work together seamlessly, without the need for expensive hardware or software upgrades.
Extend the value of legacy devices
Protocol gateways help to extend the life of legacy devices by enabling them to communicate with modern devices and networks. This is particularly important in manufacturing, where legacy equipment can be expensive to replace and may still be functional.
Reduce network implementation costs
Companies can significantly reduce network implementation costs when upgrading their factory equipment by utilizing protocol gateways. Instead of replacing the entire system, gateways enable the re-utilization of existing I/O modules and wiring infrastructure when upgrading from an old PLC system. This saves time and money and reduces disruption to the production process.
Similarly, protocol gateways facilitate PLC system extension by enabling a simple and cost-effective way of connecting devices from several brands that use different network types. This allows the end user to select the best devices available for their application rather than being limited to what one manufacturer can provide.
Future proof systems
Gateways offer companies the flexibility to support new and emerging network technologies without requiring a complete system redesign. By using gateways, companies can ensure that their systems remain up-to-date and can easily adapt to changing needs. This future-proofing approach enables businesses to stay competitive and efficient in an ever-evolving technological landscape.
Conclusion
In summary, protocol gateways were developed to solve the problem of communication barriers between devices that use different communication protocols. The gateways serve as a bridge that facilitates communication among devices regardless of the protocols they use. This feature enables seamless interoperability and extends the lifespan of legacy equipment. By using protocol gateways, industrial companies can avoid the expense of replacing existing equipment and can instead make use of their current infrastructure while still taking advantage of newer technologies.
One of the leaders in the field is Anybus, whose gateway technology has connected millions of devices to networks over the past 20 years. Anybus gateways have successfully connected devices, machines, and networks for more than 20 years and are widely used together with automation products and systems from major industrial companies such as Rockwell Automation, Siemens, Schneider Electric, Mitsubishi, etc. The Anybus Gateway portfolio consists of several protocol converters that can connect to any combination of Fieldbus or Industrial Ethernet networks.
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