Soft logic measuring and controlling system of marine auxiliary machine

Abstract

The invention discloses a soft logic measuring and controlling system of a marine auxiliary machine. The system adopts a three-layer structure. A monitoring layer main body is an upper computer, a controlling layer main body is lower computers, and an execution layer comprises an analog quantity driving device, an on-off quantity driving device, an on-off quantity sensor, an analog quantity sensor and a communication wire. The upper computer adopts a commercial embedded type flat micro computer which is installed in a central control room. Each lower computer comprises a soft logic controller, an analog quantity collection module, an on-off quantity collection module, an on-off output module, an analog quantity output module and a matched loading power supply which are installed on a measuring and controlling site. Control program is built in each soft logic controller to manage postposition modules. Important parts and looped networks in the system adopt a redundant structure. The upper computer and the lower computers are respectively provided with a central processing unit (CPU) module, the upper computer can control a plurality of lower computers simultaneously, and the lower computers can also run independently. The system has strong operating and multi-mask processing capability, can be conveniently communicated with a third party, is friendly in human-computer interface and has high reliability.

Description

technical field [0001] The invention relates to a ship auxiliary machine measurement and control system, in particular to a ship auxiliary machine measurement and control system with a soft logic controller. Background technique [0002] Modern large-scale ships have basically realized that the engine room cannot be on duty, and the water pumps, valves, fans and other auxiliary equipment and container liquid level measurement and control in the engine room can be remotely and automatically controlled. The measurement and control system of the ship's auxiliary equipment in the prior art mainly adopts an industrial computer, a single-chip microcomputer, and a PLC as a controller. Each of these controllers has its own characteristics, and can basically satisfy the monitoring of the auxiliary machines in the nacelle, but there are also some deficiencies. For example, the industrial computer has the advantages of good reliability, powerful computing function, flexible configurat...

AI Technical Summary

Problems solved by technology

For example, the industrial computer has the advantages of good reliability, powerful computing function, flexible configuration, and friendly display interface. The disadvantage is that the price is high and it is not suitable for on-site installation. , increase the installation cost; the advantage of single-chip microcomputer is cheap, small size, suitable for cabinet installation, the disadvantage is that the reliability is not high enough, the anti-interference ability is poor, the communication ability is not strong, programming and debugging is complicated; the advantage of PLC is that the price is moderate, High reliability and anti-interference ability, small size, and convenient programming. The disadvantage is that the communication interface is limited, the computing function is not powerful enough, and it cannot be competent for complex control tasks; the operating system in the PLC is a dedicated OS, which leads to poor compatibility; computing Poor ability; high analog cost; difficult networking; in addition, the common analog signals in the control need to be controlled by adding analog input and output. When the system requires more analog, the application cost of the PLC controller will be greatly increased. Increase

[0003] On the other hand, when the ship is in operation, there are relatively high requirements for the reliability of the auxiliary equipment measurement and control system, but the important components in the prior art ship auxiliary equipment measurement and control system do not adopt a redundant structure. , may cause the ship auxiliary equipment measurement and control system to fail to operate normally. Therefore, the reliability of the existing ship auxiliary equipment measurement and control system is poor, which affects the normal operation of the ship.

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