DCS/PLC signal interlocking control circuit

Abstract

The invention discloses a DCS / PLC signal interlocking control circuit comprising that a first switch K1 connected to a power source is connected to one end of a first power line, a second switch K2 isconnected to one end of a second power line, a third switch K3 is connected to one end of a third power line, the other end of the first power line is connected to the first input end of an AC contactor KM1, the other end of the second power line is connected to the second input end of the AC contactor KM1, the other end of the third power line is connected to the second input end of the AC contactor KM1, and the first output end, the second output end and the third output end of the AC contactor KM1 are all connected to a motor. The DCS / PLC signal interlocking control circuit is applied to the case that switching is performed between two power sources at a power source side, the DCS / PLC does not issue an interlocking jump instruction after the power source is restored, so that an electric appliance has a precondition for automatic restart, thereby ensuring the continuous operation of production. During normal parking or normal protection action trips, the DCS / PLC interlocking jump instruction is issued smoothly, the protective parking of the system is not affected, and the accident cannot be expanded.

Description

technical field [0001] The invention belongs to the technical field of industrial control, in particular to a DCS / PLC signal interlocking control loop. Background technique [0002] With the development of computer technology, communication technology and control technology, the traditional control field is undergoing an unprecedented change, and it is beginning to develop in the direction of networking. The requirements for large data volume and high-speed transmission such as images and voice signals have given birth to the combination of Ethernet and control network, which is currently popular in the commercial field. This wave of industrial control system networking has also integrated many popular technologies such as embedded technology, multi-standard industrial control network interconnection, wireless technology, etc., thereby expanding the development space of the industrial control field and bringing new development opportunities. [0003] The basic trend of the ...

AI Technical Summary

Problems solved by technology

But at this time, due to the release of the running signal sent to the DCS / PLC background by the contactor or relay, the inherent program of DCS / PLC will treat this transient fault as a normal fault, and send a chain trip signal, so that the entire system is in a chain trip. vehicles, resulting in large economic losses

[0010] Therefore, in the existing DCS / PLC solidification program, it is impossible to distinguish the operating signals uploaded by the electricity, which are disconnected due to power transient faults, and which are disconnected due to normal faults, and can only be disconnected according to the specific operating signal. It automatically runs its inherent control program according to the status, which makes the working condition that can continue to run become the working condition of stopping, which greatly affects the continuous production

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