DH+ (Data Highway Plus) is a proprietary communication protocol developed by Allen-Bradley, a subsidiary of Rockwell Automation. It was designed to provide high-speed communication between industrial control systems, such as programmable logic controllers (PLCs), distributed control systems (DCS), and other devices on a factory floor. DH+ uses a token-passing network architecture, where devices take turns transmitting data over a shared communication channel. This allows for reliable, deterministic communication between devices, with the ability to prioritize critical data and avoid collisions. DH+ operates at a speed of up to 57.6 kilobits per second, which is relatively slow compared to modern communication protocols. However, it is still widely used in industrial automation applications, particularly in legacy systems where upgrading to newer protocols may be difficult or impractical. DH+ uses a thick coaxial cable to transmit data, with a maximum cable length of up to 10,000 feet (3,048 meters). It also supports multiple network topologies, including star, linear, and tree configurations. DH+ is widely used in industries such as automotive manufacturing, food and beverage processing, and pharmaceuticals. Despite being a proprietary protocol, there are many third-party devices and software that can communicate with DH+ networks, allowing for interoperability with a wide range of industrial control systems.
Parijat Controlware. Inc (PCI) DH+ Systems
PCI DH+ systems provide a reliable and efficient solution for industrial automation applications. DH+ is a proprietary communication protocol developed by Allen-Bradley, and PCI has extensive expertise in designing, implementing, and maintaining DH+ systems for a range of industries. PCI DH+ systems can integrate with a wide range of industrial control systems. This includes programmable logic controllers (PLCs), distributed control systems (DCS), and other devices on a factory floor. The systems are also designed to be scalable, making it easy to add new devices and expand the network as needed. PCI DH+ systems uses a token-passing network architecture, which allows devices to take turns transmitting data over a shared communication channel. This ensures that data is transmitted reliably and without collisions, even in high-traffic environments. PCI DH+ systems support redundant configurations, ensuring that communication is maintained even in the event of a hardware failure. PCI DH+ systems are also highly customizable, allowing users to configure the network to meet their specific requirements. This includes setting up different network topologies, prioritizing critical data, and configuring security settings. PCI DH+ systems provide a robust and flexible solution for industrial automation applications. With their ability to integrate with a wide range of industrial control systems, their reliability, and their customizability, these systems are well-suited for a variety of industries, including automotive manufacturing, food and beverage processing, and pharmaceuticals.
Technical Characteristics of the PCI DH+ systems
PCI DH+ systems have a range of technical characteristics that make them a reliable and efficient solution for industrial automation applications. Some of the key technical characteristics of these systems include:
1. High-speed communication: DH+ systems are capable of communicating at speeds of up to 57.6 kilobits per second, which allows for efficient data transmission between devices.
2. Token-passing network architecture: DH+ uses a token-passing network architecture, which ensures reliable and deterministic communication between devices. This allows for the prioritization of critical data and avoids collisions.
3. Support for multiple network topologies: PCI DH+ systems support multiple network topologies, including star, linear, and tree configurations. This provides flexibility in designing and configuring the network to meet specific requirements.
4. Redundant configurations: DH+ systems support redundant configurations, ensuring that communication is maintained even in the event of a hardware failure.
5. Customizable: PCI DH+ systems are highly customizable, allowing users to configure the network to meet their specific requirements. This includes setting up different network topologies, prioritizing critical data, and configuring security settings.
6. Integration with industrial control systems: DH+ systems can integrate with a wide range of industrial control systems, including programmable logic controllers (PLCs), distributed control systems (DCS), and other devices on a factory floor. This provides interoperability with existing industrial control systems.
7. Support for thick coaxial cable: DH+ systems use a thick coaxial cable to transmit data, with a maximum cable length of up to 10,000 feet (3,048 meters).
PCI DH+ systems provide a reliable, efficient, and customizable solution for industrial automation applications. With their support for multiple network topologies, integration with industrial control systems, and support for redundant configurations, these systems are well-suited for a variety of industries.
Conclusion
PCI DH+ systems provide a robust and reliable solution for industrial automation applications. With their high-speed communication, token-passing network architecture, and support for multiple network topologies, these systems are capable of transmitting data efficiently and reliably. Additionally, their customizable nature, integration with industrial control systems, and support for redundant configurations make them well-suited for a range of industries. Whether it’s automotive manufacturing, food and beverage processing, or pharmaceuticals, PCI DH+ systems can help increase productivity, optimize processes, and ensure that critical data is transmitted securely and without interruption. With their technical expertise and commitment to customer satisfaction, PCI is a trusted partner for businesses looking to implement DH+ systems for their industrial automation needs.