CN1825293A

CN1825293A - Method of synchronizing clock signal of multi-event sequence recording station

Info

Publication number: CN1825293A
Application number: CN 200510023967
Authority: CN
Inventors: 屠勤
Original assignee: SHANGHAI HUAWEN AUTOMATION SYSTEM ENGINEERING Co Ltd
Current assignee: SHANGHAI HUAWEN AUTOMATION SYSTEM ENGINEERING Co Ltd
Priority date: 2005-02-21
Filing date: 2005-02-21
Publication date: 2006-08-30

Abstract

The invention relates to a method and device for synchronizing clock signals for multiple sequence of events (SOE) stations, where the method is characterized by: connecting GPS system with serial interface of computer; compiling corresponding application software; connecting a computer with at least two SOE stations through a multiple communication card whose communication interfaces correspond to the SOE stations one to one; and the device is characterized by comprising a GPS system, a computer, at least two SOE station and a multiple communication card. And the advantages: time synchronizing accuracy of various SOE stations is within 1 ms; it is easy to obtain materials, and the cost is relatively low.

Description

The method that a kind of clock signal of multi-event sequence recording station is synchronous

Technical field:

The present invention relates to the synchronous method of a kind of clock signal of multi-event sequence recording station, specifically, relate to be used for large-scale scattered control system ( DCS) in.

Background technology:

Large-scale scattered control system ( DCS) in, often to use sequence of events recording ( SOE) function, in large-scale scattered control system (DCS) in the past, if will use the function of sequence of events recording (SOE), then only establish a SOE station usually, so just need not to carry out synchronously, even several SOE stations are perhaps arranged, and the event signal between each station, SOE station all is incoherent, so also just need not to carry out synchronously, function and the continuous increase of input/output signal amount and the dirigibility enhancing of system design along with scattered control system (DCS), often to use several SOE stations, and the part event signal between each SOE station is correlated with, so just must carry out synchronously each different SOE station, mostly adopted the time broadcast mode on Ethernet to carry out synchronously in the past, its advantage of such method of synchronization is to need not to increase extra hardware resource, can only reach several Milliseconds but the shortcoming time precision that to be it synchronous is generally the highest, and another method is at each SOE station one cover to be set all GPSSystem, its advantage are that synchronization accuracy is very high, but so often make system cost also become very high.And the resolution that the SOE station requires is 1 millisecond or hundreds of microsecond, so method in the past generally can not satisfy actual demand.

Summary of the invention:

The objective of the invention is to invent and a kind ofly make the time synchronized between each SOE station be accurate to 1 millisecond with the synchronous method of interior clock signal of multi-event sequence recording station.

For realizing purpose of the present invention, technical scheme to be solved by this invention is the synchronous method of a kind of clock signal of multi-event sequence recording station, it is characterized in that,

1-1. gps system is linked to each other with computer by serial;

1-2. write corresponding application software;

1-3. a computing machine and at least two sequence of events recording ( SOE) connect by many address cards between standing, the communication port of many address cards and each sequence of events recording ( SOE) correspondence one by one of standing.

The method devices needed that a kind of clock signal of multi-event sequence recording station is synchronous is characterized in that, comprise a cover gps system, computing machine, at least two sequence of events recording ( SOE) stand and address card more than.

A described cover gps system interface can link to each other with computing machine; A described computing machine can with IBM_PC

Compatibility, operation system of computer adopts DOS6.0 or above version; Described many address cards can for

Station reference time of RS232, RS485, CAN, PROFIBUS or the like serial communication interface, communication port

Quantity is decided by the quantity that required synchronous sequence of events recording (SOE) is stood.

Ultimate principle of the present invention is station reference time that address card more than is set specially, and the quantity of communication port is decided by required synchronous SOE station quantity.In order between manufacturing cost and synchronization accuracy, to reach an equilibrium point, its principle be a bit (station reference time) to the serial communication of multiple spot (each SOE station), all come from same reference time of station the reference time at each SOE station, the form of communication can adopt the regular length frame, and be identical substantially with respect to the point-to-point communication response time, be that error is less than 1 millisecond, each SOE stands and lags behind the communication time of standing reference time one time resulting lock in time like this, can revise this retardation time, can not revise yet, because of SOE station not high to the accuracy requirement of absolute time, but each SOE station having relatively high expectations synchronously to the time.

Advantage of the present invention is that the time synchronized between each SOE station is accurate in 1 millisecond, draws materials easily, and cost is cheap relatively.

Description of drawings

Fig. 1 is the multi-event sequence recording station synoptic diagram;

Fig. 2 is a program flow diagram.

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Embodiment

As shown in Figure 1, be the multi-event sequence recording station synoptic diagram, stand with four sequence of events recording (SOE) and to be example, the SOE station is the RS485 interface, the MODBUS agreement, with a computing machine, the IBM_PC compatibility, add the address card of lastblock four serial ports (RS485) and the gps system of a cover band RS232 interface, more than these equipment on market, can both purchase, operation system of computer adopts DOS6.0 to get final product, four serial communication cards are inserted in the slot of computing machine, again gps system are linked to each other with computer by serial (RS232 interface), write corresponding application software, the basic demand of application software is the read data order that obtains from which RS485 interface, just from which RS485 interface echo back data, it is slave station that the relative SOE that stands reference time stands, and is main website to gps system.

During work, four RS485 interfaces to standing reference time are connected with the RS485 interface at four SOE stations respectively, reference time, the node address at station can not be identical with other fasteners, host node in each SOE station is responsible for sending the read data order to the phase of standing firm reference time, reference time, the station then was responsible for reading reference time from gps system after receiving certain RS485 read data order, and then arrive corresponding SOE with the mode echo back data of broadcasting and stand, SOE has just finished after receiving at the station data synchronously, as shown in Figure 2.

Claims

1. the method that clock signal of multi-event sequence recording station is synchronous is characterized in that,

1-1. gps system is linked to each other with computer by serial;

1-2. write corresponding application software;

2. the method devices needed that clock signal of multi-event sequence recording station is synchronous is characterized in that, comprise a cover gps system, computing machine, at least two sequence of events recording ( SOE) stand and address card more than.

3. the method devices needed that a kind of clock signal of multi-event sequence recording station according to claim 2 is synchronous is characterized in that, a described cover gps system interface can link to each other with computing machine.

4. the method devices needed that a kind of clock signal of multi-event sequence recording station according to claim 2 is synchronous is characterized in that, a described computing machine can with the IBM_PC compatibility, operation system of computer adopts DOS6.0 or above version.

5. the method devices needed that a kind of clock signal of multi-event sequence recording station according to claim 2 is synchronous, it is characterized in that, described many address cards can be station reference time of RS232, RS485, CAN, PROFIBUS or the like serial communication interface, and the quantity of communication port is decided by the quantity that required synchronous sequence of events recording (SOE) is stood.