摘要:
Die Erfindung betrifft ein Verfahren basierend auf einem Kommunikations- und Datennetz zur automatischen Zeitsynchronisation von Feldgeräten, nämlich Füllstandsmessgeräten und Druckmessgeräten, sowie Feldgerätesteuerungen. Das Verfahren weist die Schritte: Bestimmen eines aktuellen Zeitwertes durch das Feldgerät oder durch die Feldgerätesteuerung und Bereitstellung eines Sollwertes in einem zentralen Server auf. Weiterhin sind folgende Schritte in dem Verfahren enthalten: Vergleich des aktuellen Zeitwerts mit dem Sollwert und Einstellen des aktuellen Zeitwerts auf den Sollwert, wenn der Sollwert vom aktuellen Zeitwert um mehr als einen vorgegebenen Schwellwert abweicht.
摘要:
Techniques for network based triggering in an instrument system that enable instruments to effectively signal events without hardwired trigger lines. An instrument system 100 according to the present teachings includes a first instrument and a second instrument coupled to a local area network. The first instrument is capable of performing an action in response to an event that is signaled by the second instrument. The second instrument signals the event to the first instrument by transferring a trigger message 60 via the local area network.
摘要:
The invention concerns a method for cyclically transferring data between at least two separately operating control apparatus. The method is used in particular for transferring synchronisation data between the control apparatus (10, 11, 12). The control apparatus (10, 11, 12) are interconnected by means of a serial bus (20). The control apparatus (10, 11, 12) each comprise a serial interface (17) and a computing/control unit (15, 18). A computing/control unit (15, 18) of one of the control apparatus (10, 11, 12) cyclically prepares data to be transferred by means of the serial bus (20). The data are transferred by means of a message via the serial bus (20). For this purpose, the computing/control unit (15, 18) of the control apparatus (10) sending the message places a transmission order for dispatching the message to the serial interface (17). The serial interface (17) then develops the transmission order. However, this occurs in such a way that, when the message is sent, it is not those data which were prepared when the computing/control unit (15, 18) placed the transmission order which are used but, instead, the data updated by the computing/control unit since the time when the transmission order was issued. In addition, further advantageous bus user stations are proposed for use in the above method.
摘要:
Provided is an information processing device constituting at least a part of a communication system. The information processing device includes a master unit connected to a first communication line, and at least one slave unit connected to the master unit via a second communication line. The master unit includes: a first communication unit for transmitting/receiving data with another device via the first communication line in every predetermined cycle; a second communication unit for transmitting/receiving data with the slave unit via the second communication line in a time period shorter than the cycle; and an update unit for, after preceding data is received via the first communication line, updating data with the slave unit via the second communication line before arrival of subsequent data corresponding to the next cycle.
摘要:
Die Erfindung betrifft ein Verfahren basierend auf einem Kommunikations- und Datennetz zur automatischen Zeitsynchronisation von Feldgeräten, nämlich Füllstandsmessgeräten und Druckmessgeräten, sowie Feldgerätesteuerungen. Das Verfahren weist die Schritte: Bestimmen eines aktuellen Zeitwertes durch das Feldgerät oder durch die Feldgerätesteuerung und Bereitstellung eines Sollwertes in einem zentralen Server auf. Weiterhin sind folgende Schritte in dem Verfahren enthalten: Vergleich des aktuellen Zeitwerts mit dem Sollwert und Einstellen des aktuellen Zeitwerts auf den Sollwert, wenn der Sollwert vom aktuellen Zeitwert um mehr als einen vorgegebenen Schwellwert abweicht.
摘要:
A distributed control system architecture (HSE) provides an open, interoperable solution optimized for integration of distributed control systems and other control devices in a high performance backbone, provides an open, interoperabie solution that provides system time synchronization suitable for distributed control applications operable over a high performance backbone, and provides an open, interoperable solution that provides a fault tolerant high performance backbone as well as fault tolerant devices that are connected to the backbone. The distributed control system architecture comprises a High speed Ethernet Field Device Access (HSE FDA) Agent, which maps services of a distributed control system, e.g., a fieldbus System, to and from a standard, commercial off-the-shelf (COTS) Ethernet/Internet component. The distributed control system architecture also comprises a High speed Ethernet System Management Kernel (HSE SMK) that operates to keep a local time, and keeps the difference between the local time and a system time provided by a time server within a value specified by the time sync class. The local time is used to time stamp events so that event messages from devices may be correlated across the system. The distributed control system architecture further comprises a High speed Ethernet Local Area Network Redundancy Entity (HSE LRE) that provides redundancy transparent to the applications running on the system. The HSE LRE of each device periodically transmits a diagnostic message representing its view of the network to the other Devices on the system. Each device uses the diagnostic messages to maintain a Network Status Table (NST), which is used for fault detection and selection from a redundant pair of resources.
摘要:
A synchronous controller is formed with a cycle master module and one or more control modules doubly connected through a synchronous bus and an event bus. The event bus is used for transmitting data with a larger volume. The control modules each cyclically carry out execution of a user program for controlling an object apparatus to be controlled. The cycle master module exchanges data with the control modules through the event bus and the synchronous bus. Each of the control modules carries out one cycle of the execution of the user program by using reception of synchronous data transmitted from the cycle master module through the synchronous bus as a trigger.
摘要:
Techniques for network based triggering in an instrument system that enable instruments to effectively signal events without hardwired trigger lines. An instrument system 100 according to the present teachings includes a first instrument and a second instrument coupled to a local area network. The first instrument is capable of performing an action in response to an event that is signaled by the second instrument. The second instrument signals the event to the first instrument by transferring a trigger message 60 via the local area network.