Circuit system for controlling external devices

Abstract

The invention discloses a circuit system for controlling external devices. The circuit system comprises a circuit board and a PLC (Programmable Logic Controller), wherein the circuit board is connected with the PLC; a plurality of function modules are arranged on the circuit board and used for expanding the ports for the connection of the PLC and the external devices; the function modules are connected with the external devices through a detachable connection manner; the PLC sends control signals to the function modules; the function modules control the work states of the external devices according to the control signals and feed the signals generated by the external devices back to the PLC; and then the PLC resends corresponding control signals to the function modules according to the received signals. The invention aims at providing a circuit system using a new expansion manner to ensure that the occupied space of the PLC after expansion is less, the wiring error probability is reduced and the maintenance is convenient.

Description

technical field [0001] The invention relates to a circuit system, in particular to a circuit system using a PLC controller. Background technique [0002] PLC controller (Programmable logic Controller, Programmable Logic Controller) is an electronic system for digital operations, designed for use in industrial environments. It uses a type of programmable memory for its internal storage program, execution of user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and controls various types of machinery through digital or analog input / output Or production process, is the core part of industrial control. [0003] PLC controllers are generally produced and sold by international specialized manufacturers. After industrial control companies purchase PLC controllers, they input specific control programs internally to realize control functions. At present, the control ports of PLC controllers in basic industries are all plu...

AI Technical Summary

Problems solved by technology

[0004] With the development of society, it is necessary to use the circuit system to control a large number of equipment to work in various industries, and the PLC controller is a kind of circuit system PLC controller with wide applicability; but when there are too many devices to be controlled, The number of ports of the PLC controller itself cannot meet the actual needs, so it is often necessary to add expansion modules to increase the number of ports of the PLC controller

[0005] However, the existing expansion modules are combined with the PLC controller, and each expansion module has a larger volume, so the more expansion modules are added, the larger the space occupied; more importantly, the PLC controller And the expansion module is connected to the device through wiring, that is, each port leads to a connecting line, so the number of connecting lines is huge, which makes it easy to connect wrongly when wiring, and when the equipment needs to be repaired, it is difficult to find out which line it is problem appear

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