System and method for realizing equipment control mode centralized undisturbed transfer

Abstract

The invention discloses a system and a method for realizing equipment control mode centralized undisturbed transfer. The system comprises a centralized transfer electricity operation table, a centralized transfer relay and an undisturbed transfer electricity control loop, wherein an equipment control model centralized transfer switch and a pre-transfer button are arranged on the centralized transfer electricity operation table, each transfer switch is provided with an on-site control mode gear, a centralized control mode gear and a middle gear, each transfer switch is used for controlling one or a plurality of centralized transfer relays; normally open contacts of the centralized transfer relay are respectively connected with an undisturbed transfer electricity control loop corresponding to the transfer switch; the undisturbed transfer electricity control loop comprises an equipment control relay and normally open contacts of an equipment control middle relay controlled by PLC / DCS (programmable logic controller) / (distributed control system). According to the system and the method disclosed by the invention, the centralized management and control capacity of a control chamber to industrial field process equipment is improved, the undisturbed transfer between the on-site control mode and the centralized control mode of the equipment control mode is realized, so that the controlled equipment in running can be normally operated and maintained conveniently.

Description

technical field [0001] The invention belongs to the technical field of electrical automation, and in particular relates to a system and method for realizing centralized and disturbance-free switching of equipment control modes. Background technique [0002] In the distributed control of the process industry, the basic control content mainly includes equipment control and loop control. Equipment control is to control the start and stop of all process equipment in the production process according to the process and production requirements, monitor their operating status, issue alarms, and automatically shut down, etc. Generally, the drag motor of the control equipment runs in one direction (accounting for the vast majority) or runs in forward and reverse directions. There are generally two types of start-stop control methods for equipment. In normal production, the start and stop of the controlled equipment is generally required to issue commands on the monitoring computer i...

AI Technical Summary

Problems solved by technology

[0005] Although the above equipment control mode conversion system is simple and easy to implement, it has the following deficiencies during the implementation of the distributed control automation project and the actual use of users: 1) Because the conversion switches are all set on the control box next to the machine, so The selection and conversion of equipment control methods cannot be performed in the control room, which greatly weakens the ability of the control room to control the controlled equipment on site

2) For the controlled equipment in the running state, when the transfer switch is turned from the "side control mode" gear to the "centralized control mode" gear, it will definitely cause a shutdown, which will bring some troubles

3) The transfer switches are distributed to the control boxes next to each controlled device on site, which is very inconvenient in operation to realize the simultaneous control mode conversion of multiple controlled devices

This shows a lack of design for closely interlocked equipment chains such as belt transmission systems

4) In the distributed control, it is not necessary to set up a transfer switch for each controlled device, which will cause too many points of DI digital input (digital input, the same below) on the configuration of the PLC / DCS system, and automation engineering Cost increase

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