The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With the nowadays rapidly increasing complexity and distribution of automation and control systems the communication has an increasing impact on the control and measurement tasks. There are several approaches to ensure real-time communication in distributed systems. However these are typically based on complex hardware or middleware concepts. This paper will show an approach for real time communication...
ICx Radiation, Inc. has implemented a novel timing method for use in a Compton telescope that is capable of nanosecond timing resolution. A critical task in Compton telescope design is to minimize the timing variance between detectors in a large array in order to reduce the background. The voxelSPEC has been developed to combine precise timing with pulse processing electronics in a single device,...
Using IEEE 1588 for highly accurate clock synchronization between nodes of a distributed system has become a widely accepted approach. IEEE 802.3/Ethernet is frequently utilized as communication layer to exchange the Precision Time Protocol (PTP) messages specified in the IEEE 1588 standard. 10/100/1000 MBit Ethernet communication is commonly used by now. In contrast, fiber optics based 10 GBit Ethernet...
The paper presents a novel method for constructing soft servo networked motion control system via EtherCAT network. The EtherCAT network performance is analyzed in detail through comparison of it by other several industry Ethernet protocols. We give out the application PLC program flow chart of synchronous control. The experiment results show that the soft servo networked motion control system can...
A real-time communication medium must provide a special coordination mechanism to guarantee bounded communication delays. Implementing this mechanism in software offers flexibility but reduces reliability and performance. On the other hand, customized hardware solutions deliver high throughput and predictability, but they increase the implementation cost and are unable to adapt to the specific needs...
It requires accurate synchronization among the MCU, servo controllers and sensors in CNC systems for time stamping of data and motion control. This paper presents the design and implementation of time synchronization for CNC systems which employ switched Ethernet as its communication module. The method adopts the clock of switches as the master clock instead of that of MCU which usual is. To obtain...
In various CNC systems the MCU, servo controllers and sensors all need to be accurately synchronized for time stamping of data and motion control. This paper presents a time synchronization method for CNC systems based on switched Ehternet in which message delay variation through switches must be minimized or compensated to obtain accurate time synchronization. The method uses the switch as the time...
Achieving high-performance message passing on top of generic Ethernet hardware suffers from the NIC interrupt-driven model where coalescing is usually involved. We present an in-depth study of the impact of interrupt coalescing on the Open-MX performance. It shows that disabling coalescing may not be relevant for most metrics except small-message latency. Two new coalescing strategies are then presented...
In this paper, we present a selective time synchronization algorithm (STSA) based-on two selective switches using a hardware timestamp at a low-level layer to reduce time synchronization errors over Ethernet, and give the improved formula to calculate the time offset when considering the frequency offset factor in SNTP. The STSA transmits frame-based time synchronization frame on a truncated constant...
A packet generator and network traffic capture system has been implemented on the NetFPGA. The NetFPGA is an open networking platform accelerator that enables rapid development of hardware-accelerated packet processing applications. The packet generator application allows Internet packets to be transmitted at line rate on up to four gigabit Ethernet ports simultaneously. Data transmitted is specified...
Distributed real-time applications implement distributed applications with timeliness requirements. Such systems require a deterministic communication medium with bounded communication delays. Ethernet is a widely used commodity network with many appliances and network components and represents a natural fit for real-time application; unfortunately, standard Ethernet provides no bounded communication...
In the recent past we have seen open standards based data acquisition and telemetry systems supplant proprietary systems. Asynchronous Transfer Mode (ATM) was a great choice for sonar and related synchronous sampling systems as the network was built on the concept of a synchronous backbone from which system timing could be derived. Unfortunately for all but the largest of backbones, ATM has been replaced...
End-to-end communications on 10 Gigabit Ethernet (10 GbE) WAN became popular. However, there are difficulties that need to be solved before utilizing Long Fat-pipe Networks (LFNs) by using TCP. We observed that the followings caused performance depression: short-term bursty data transfer, mismatch between TCP and hardware support, and excess CPU load. In this research, we have established systematic...
Distributed real-time applications implement distributed applications with timeliness requirements. Such systems require a deterministic communication medium with bounded communication delays. Ethernet is a widely used commodity network with a large number of appliances and network components and represents a natural fit for real-time application; unfortunately, standard Ethernet provides no bounded...
Ethernet is emerging as the preferred industrial communication platform upon which a multitude of protocols and solutions specially targeted at industrial communication requirements have been developed. This paper concentrates on a set of protocols popularly referred to as the Real-time Ethernet protocols and analyses two key technologies, namely PROFINET IRT and EtherCAT. The real-time performance...
In this paper, we propose an Ethernet-based transmission-guaranteed, congestion-controlled network using a simplified multi-path aggregation scheme. Multi-path aggregation increases throughput by multiplying the bandwidth of a single path by the number of paths. There are several aggregation schemes, such as Link Aggregation and Multi-path TCP. However, Link Aggregation is unable to utilize multiple...
Describes a new network design for low-latency synchronization and communication and describes the synchronization mechanism on a synchronization/communication controller (SCC) that can be plugged into each workstation/PC connected via a conventional LAN. Each SCC is connected by a new type of network (a sync-comm network). Each node sends high-throughput data to the desired destination over a conventional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.