CN203588045U - GPS directly-taking-type accurate SOE recording system - Google Patents

Abstract

The utility model relates to a GPS direct-fetching precise SOE recording system, comprising at least one workstation and a GPS system, all workstations establish connections with at least one control processor through a communication control bus, and each control processor communicates with at least two control processors through a field bus. A multi-event sequence recording station establishes a connection, which is characterized in that the GPS system is directly connected to all the multi-event sequence recording stations, and the GPS system provides a unified time reference source for all the multi-event sequence recording stations. The utility model has the advantages that the date and time data are directly read from the GPS system, and the pure level signal of the non-communication network technology is used as a synchronization reference trigger point to ensure that the time synchronization of each SOE is accurate to within 1 millisecond, so that each SOE The data resolution between the real 1 millisecond.

Description

GPS direct access accurate SOE recording system

technical field

The utility model relates to a multi-event sequence recording station (hereinafter referred to as SOE) time reference synchronization system, which is used to overcome the inaccuracy caused by the time reference offset of multiple SOEs in the current decentralized control system (hereinafter referred to as DCS), It belongs to the technical field of automatic control instruments.

Background technique

In a large-scale DCS, with the continuous increase of function and scale and the continuous enhancement of system design flexibility, several SOEs are often required, and some event signals between each SOE are correlated, so it is necessary to control each different SOE performs time synchronization.

At present, the vast majority of DCSs at home and abroad use the time broadcast method on the Ethernet to synchronize the control processor DPU, and then the control processor DPU synchronizes the SOE. Even if the GPS system is used, the GPS system is either as shown in Figure 1 , to synchronize a designated workstation (the workstation is the time server) in the network, and then the workstation synchronizes the other workstations and the control processor DPU. In this way, the time synchronization data transmission needs to go through the three-layer communication protocol. and the network path; or as shown in Figure 2, the GPS system itself, as a time server, synchronizes the workstations and the control processor DPU in the network, and finally the control processor DPU synchronizes the SOE. This method is for time-synchronized data Transmission goes through two layers of communication protocols and network paths. However, due to the time difference in network data transmission, especially the fieldbus between the control processor DPU and SOE, the communication rate cannot be very high, but the security requirements are high (the communication process needs to be verified), so its different The time accuracy of SOE can only reach a few milliseconds at most, and the most basic resolution of SOE is 1 millisecond, so the existing methods generally cannot meet the actual needs.

Contents of the invention

The technical problem to be solved by the utility model is to make the time synchronization between each SOE really accurate to 1 millisecond.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is to provide a GPS direct access type accurate SOE recording system, including at least one workstation and a GPS system, and all workstations are connected to at least one control processor through a communication control bus, Each control processor establishes connection with at least two multi-event sequence recording stations through the field bus, which is characterized in that the GPS system is directly connected with all the multi-event sequence recording stations, and the GPS system provides a unified time for all the multi-event sequence recording stations reference source.

Preferably, the GPS system is equipped with a differential module with RS485 serial port and a TTL module with pulse level output; each of the multi-event sequence recording stations is outwardly extended with an RS485 serial port interface and a SYNC synchronous interface; all multi-event sequence recording The RS485 serial port of the station is connected with the RS485 serial port of the differential module of the GPS system, and the SYNC synchronous interface of all multi-event sequence recording stations is connected with the output terminal of the TTL module of the differential module of the GPS system.

The utility model has the advantages that: directly read the date and time data from the GPS system, and use the pure level signal of the non-communication network technology as the synchronization reference trigger point to ensure that the time synchronization of each SOE is accurate to within 1 millisecond, so that each SOE The resolution of the data in between really reaches 1 millisecond.

Description of drawings

Fig. 1 is a schematic diagram of a GPS time synchronization method of a traditional DCS;

Fig. 2 is a schematic diagram of GPS time synchronization mode 2 of the traditional DCS;

Fig. 3 is the schematic diagram of the precise SOE recording system of the GPS direct-taking type of the present utility model;

Fig. 4 is a schematic diagram of a prototype of a three-redundancy fault control system with GPS direct-fetching precise SOE recording technology.

Detailed ways

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

As shown in Figure 3, a GPS direct-fetching accurate SOE recording system disclosed in this embodiment includes a plurality of workstations, and all workstations establish connections with a plurality of control processors DPU through a communication control bus at the same time, and each control processor DPU A plurality of multi-event sequence recording stations SOE are connected through the field bus.

The GPS system is equipped with a differential module with RS485 serial port and a TTL module with pulse level output. Each multi-event sequence recording station SOE has an RS485 serial interface and a SYNC synchronous interface for outward expansion. The RS485 serial port of all multi-event sequence recording stations SOE is connected to the RS485 serial port of the differential module of the GPS system, and the SYNC synchronization interface of all multi-event sequence recording stations SOE is connected to the output terminal of the TTL module of the differential module of the GPS system. The data transmitted by the RS485 serial port of the differential module of the GPS system includes date and time, while the TTL module transmits level signals, not communication data, and has no disadvantage of network delay.

After the utility model is applied to the three-redundant fault control system, as shown in Figure 4, each group of control processors DPU of the three-redundant fault control system can be connected to 96 pieces of various types of clamps, and each clamp is a Multiple Sequence of Events Recording Station SOE. The entire system can have 64 group controllers. Figure 4 is a DEMO demonstration system of a triple-redundancy control system, which has two sets of engineer stations, a set of switches, and two sets of triple-redundancy controller control processors DPU. The machine slot has two digital input cards, two digital output cards, two analog input cards and two analog output cards.

For industries such as nuclear power plants, refineries, and thermal power plants that require large-scale DCS, the number of points recorded in the associated event sequence is the number of points in each SOE, so the points recorded in the event sequence will be placed in different SOEs of the same control processor DPU Under, or under different SOE of different control processor DPU.

Multi-point millisecond pulse generators are connected under different SOEs of the same control processor DPU, or under different SOEs of different control processors DPU. Each output of the multi-point millisecond pulse generator is connected to one point in the SOE, so that each The time interval between each point captured by each SOE is 1 millisecond for testing. At this time, when the SOE recording technology of GPS direct acquisition is not used, the traditional time synchronization method is used. According to the cards of each control processor DPU Depending on the number, the data obtained by SOE sampling will differ by several milliseconds, and even the order of the front and back will be disordered. However, when the GPS direct-fetching SOE recording technology of the present invention is adopted, the sequence of SOE events can be accurately identified, and the difference between each other is 1 millisecond.

Claims (2)

1. A GPS direct access type accurate SOE recording system, including at least one workstation and a GPS system, all workstations are connected to at least one control processor (DPU) through a communication control bus, and each control processor (DPU) passes through the on-site The bus establishes connections with at least two sequential recording stations of multiple events (SOEs), and is characterized in that the GPS system is directly connected to all sequential recording stations of multiple events (SOEs), and the GPS system provides unified source of time reference. 2. the accurate SOE recording system of a kind of GPS direct-fetching type as claimed in claim 1, is characterized in that: described GPS system is provided with the difference module of RS485 serial port and the TTL module of pulse level output; The multi-event sequence recording station (SOE) has RS485 serial port interface and SYNC synchronous interface to expand outward; the RS485 serial port of all multi-event sequence recording stations (SOE) is connected with the RS485 serial port of the differential module of the GPS system, and all the multi-event sequence recording stations ( The SYNC synchronous interface of SOE) is connected with the output end of the TTL module of the differential module of the GPS system.

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