PLC (programmable logic controller) and various input voltage compatibility method thereof
A technology of input voltage and controller, which is applied in the direction of program control and electrical program control in sequence/logic controllers, can solve the problems of low input flexibility and difficulty in compatible voltage, etc., achieve wide adaptability and improve flexibility , easy cost control effect
Active Publication Date: 2012-05-02
深圳市合信自动化技术有限公司
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Problems solved by technology
[0005] The existing PLC controller and its extended input and output modules are difficult to be compatible with a variety of standard input voltages, or there is a problem that voltage compatibility control needs to be performed on each input point of the PLC controller and its extended input and output modules, and the input flexibility is not enough high
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[0033] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0034] see figure 1 , the embodiment of the present invention provides a PLC controller, which can be compatible with various input voltages of the PLC controller and its extended input and output modules. The PLC controller includes: an internal circuit 1, an input circuit 2, and a control circuit The controllable voltage divider circuit 3 that the input circuit 2 conducts and disconnects, the internal circuit 1 and the controllable voltage divider circuit 3 are connected in the input circuit 2 respectively; The controllable voltage divider circuit 3 includes a comparison device 31 and is the 31 provides a voltage divider circuit 32 of the reference voltage, the comparison device 31 is connected to the input circuit 2, and the voltage divider circuit 32 is electrically connected to the comparison device 31;
[0035] The comparing device 31 compares the...
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The invention discloses a PLC (programmable logic controller). The PLC comprises internal circuits, input circuits and a controllable voltage division loop used for controlling on and off of the input circuits, wherein the input circuits and the controllable voltage division loop are respectively connected in the input circuits; the controllable voltage division loop comprises comparison devices and a voltage division circuit for providing reference voltage to the comparison devices; the comparison devices are connected in the input circuits; and the voltage division circuit is electrically connected with the comparison devices. The invention also discloses a various input voltage compatibility method of the PLC. By implementing the PLC and the various input voltage compatibility method, various other standard input voltages can achieve compatibility; the controllable voltage division loop can be manually adjusted to control a plurality of input points on the PLC and extended input and output module of the PLC and the circuit has simple structure, so the cost is easy to control; and the input flexibility is improved and extensive adaptability is ensured.
Description
technical field [0001] The invention relates to the technical field of programmable control, in particular to a PLC (Programmable Logic Controller, Programmable Logic Controller) controller and a compatibility method for various input voltages thereof. Background technique [0002] Programmable logic controller is an automatic control device for real-time control, which is widely used in the field of industrial control. PLC can be divided into large PLC, medium PLC and small PLC according to the number of its input ports and output ports. [0003] The existing PLC controller and its extended input and output modules have certain defects due to unreasonable circuit structure design. For example, the standard input voltage of the existing PLC controller and its extended input and output modules is a single preset value, such as 5V, 12V or 24V; after the PLC controller is completed, its standard input voltage is also determined accordingly, and cannot Change, that is, one por...
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IPC IPC(8): G05B19/05
Inventor 陈海峰
Owner 深圳市合信自动化技术有限公司