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Network subscriber station having a feature that prevents inaccuracies in time messages

a network subscriber station and inaccuracy technology, applied in the direction of instruments, electric programme control, generating/distributing signals, etc., can solve the problem of time messages that are erroneous with respect to transmittal and/or receive time, and achieve the effect of preventing inaccuracy

Inactive Publication Date: 2002-09-12
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] One object of the invention is thus to create a network user station of the initially mentioned type which substantially prevents inaccuracies with respect to a transmittal and / or processing instant of the time of day.

Problems solved by technology

Due to different dwell times of a time message in the transmitter and / or receiver of the network user station, it can occur that the times stored in the time message are erroneous with respect to the transmittal and / or receive time in the transmitting and / or receiving mode.

Method used

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  • Network subscriber station having a feature that prevents inaccuracies in time messages
  • Network subscriber station having a feature that prevents inaccuracies in time messages
  • Network subscriber station having a feature that prevents inaccuracies in time messages

Examples

Experimental program
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Embodiment Construction

[0013] In FIG. 1, reference numeral 1 identifies a network, e.g., a local area network (LAN). A plurality of network user stations 2a, 2b, 2c, . . . is connected to the network 1, each of which has a receiver 3a, 3b, 3c, . . . and a transmitter 4a, 4b, 4c, . . . . The present example assumes that the transmitter 4a of the network user station 2a is to transmit to receiver 3c of network user station 2c messages 5a, 5b, 5c, 5d, 5e in a message string 6, via a network connection 23. Message 5d is a time message. The time message 5d contains the time of day of a timer 7 of the network user station 2a, which can be externally synchronized by a signal 8. A timer 9 of network user station 2c must be synchronized with the time of day entered in time message 5d at an input instant. Due to the fact that a network controller 10 of the transmitter 4a transmits messages 5a, 5b, 5c, 5d, 5e to receiver 3c in the time sequence in which they were deposited in the message string 6, the time entered i...

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PUM

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Abstract

A network user station (2), which in a transmitting mode transmits telegrams (5) to another network user station (2) and in a receiving mode receives telegrams (5) from another network user station. Said telegrams contain messages of identical message length in a message string. One of said messages is a time message (5d) provided with a time of day. The network user station is provided with means (11; 13) for substantially preventing inaccuracies with respect to a transmittal and / or processing instant of the time of day.

Description

[0001] This is a Continuation of International Application PCT / DE99 / 03443, with an international filing date of Oct. 28, 1999, which was published under PCT Article 21(2) in German, and the complete disclosure of which is incorporated into this application by reference.FIELD OF AND BACKGROUND OF THE INVENTION[0002] The invention relates to a network user station, which can be connected with another network user station and which, in a transmitting mode, transmits telegrams to the other network user station and in a receiving mode receives telegrams from the other network user station. These telegrams contain messages of identical message length in a message string. One of these messages is a time message provided with a time of day.[0003] Such a network user station is known from the Siemens catalog ST 70, chapter 12, 1997 edition. This network user station is suitable for use in a distributed automation system including a plurality of automation components, which must be synchroniz...

Claims

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Application Information

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IPC IPC(8): G05B19/05G06F1/14H04J3/06
CPCG06F1/14H04J3/0673H04J3/0697
Inventor EGLE, FRIDOLINMUENCH, CHRISTOPH
Owner SIEMENS AG