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Serial communication interface time sharing multiplex device based on programmable logic controller

A serial communication interface and programming logic technology, applied in the field of serial communication interface time-division multiplexing devices, can solve the problems of reduced communication efficiency and increased cost.

Active Publication Date: 2015-06-10
AVIC BEIJING CHANGCHENG AVIATION MEASUREMENT & CONTROL TECH INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using the RS-232 communication port expansion module to connect more than two RS-232C interface communication devices will not only increase the cost but also reduce the communication efficiency.

Method used

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  • Serial communication interface time sharing multiplex device based on programmable logic controller

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Embodiment

[0011] The RS-232C interface including the PLC controller 1 is first connected with the RS485 / RS232C converter 2, and the serial port 232 signal of the PLC controller 1 is converted into a serial port 485 signal, and the 485 signal is divided into 3 channels in parallel, and one channel passes through the relay K5 The normally closed contact of the normally open contact series relay K6 is connected to the 485 interface of the RS485 / RS232C converter 3, and the RS-232C interface of the RS485 / RS232C converter 3 is connected to the RS-232C interface of the first barcode reader 6 Interface connection; the other way is connected with the 485 interface of the RS485 / RS232C converter 4 through the normally closed contact of the relay K5 in series with the normally closed contact of the relay K6, and the RS-232C interface of the RS485 / RS232C converter 4 is connected with the barcode printer 6 RS-232C interface connection; the third way is connected with the 485 interface of the RS485 / RS2...

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Abstract

The invention relates to a serial communication interface time sharing multiplex device based on a programmable logic controller, which is characterized in that one RS-232C interface of a programmable logic controller (PLC) is simultaneously connected with two or more than two pieces of equipment carrying out communication through the RS-232C interface. ( wherein RS refers to the recommended standard, 232 refers to the identifier and C refers to the last revision) and belongs to the technical field of automatic control equipment. The RS-232C interface on the programmable logic controller in the device is firstly connected with the RS-232C interface of a first RS485 / RS232C converter; the RS485 interface of the first RS485 / RS232C converter is connected with two RS485 / RS232C converters in parallel; the two RS485 / RS232C converters are respectively connected with external equipment carrying out communication with different programmable logic controllers through the normally open contact and the normally closed contact of a relay. In the invention, the RS-232C interface of a PLC native is simultaneously connected with two or more than two pieces of equipment carrying out communication through the RS-232C interface, and thereby, the hardware cost of a communication port expansion module is saved.

Description

technical field [0001] The invention belongs to the technical field of automatic control equipment, and relates to a programmable logic controller (PLC) with an RS-232C interface to simultaneously connect two or more equipment for communication through the RS-232C interface. The serial communication interface time-division multiplexing device of the programming logic controller. Background technique [0002] At present, most programmable logic controllers (PLCs) only have one RS-232C interface. According to the usage characteristics of the RS-232C interface, the RS-232C interface can only be used one-to-one, so the PLC (PLC) can only be connected to one RS-232C interface communication device. [0003] If the programmable logic controller (PLC) needs to control two or more RS-232C interface communication devices, it is necessary to add a communication port expansion module. The communication interface of the programmable logic controller (PLC) cannot directly access the loc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/40
Inventor 张振伟匡宣羽杨超郭强何晶
Owner AVIC BEIJING CHANGCHENG AVIATION MEASUREMENT & CONTROL TECH INST
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