Series PLC host computer and fast parallel communication interface of expanding machine

Abstract

A parallel fast communication interface of the series PLC mainframe and expanding machine, it includes: PLC mainframe and at least one expanding machine, and mutual connecting in series with the set connecting module, and connecting the address lines, data lines, control line and input and output addressable lines of the built-in shared bus, to form the series parallel communication interface connecting. The PLC mainframe further provides the initial address output circuit, and through the output addressable lines, outputs the address value to the expanding machine. The expanding machine contains microprocessor and memory module, with addressable and decoding circuit, which automatic distributes the location of each expanding machine, to rapid decode and select by the address value input by the above addressable lines, and making the expanding machine automatic allow or disallow the data sent by the PLC mainframe, so as to improve the problems such as data reading and writing communications time too long, increasing the expanding machines, and the order sequence restricted, etc.

Description

Technical field [0001] The invention relates to a parallel fast communication interface between a serial PLC host and an expansion machine, in particular to a parallel automatic addressing that can be formed between a serially connected PLC host and a plurality of expansion machines to select the data read and write communication of the expansion machine , It can quickly read and write data to shorten the communication time, and can add expansion units at will according to functional requirements and does not limit the arrangement of the expansion units. The parallel fast communication interface of the PLC host and the expansion unit. Background technique [0002] Known programmable logic controllers (PLC, Programmable Logic-Controller) are connected to external devices or equipment through their external I / O ports, and perform external operation control in conjunction with the editing program of the programmable logic controller. However, the number of external I / O ports of the ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned parallel parallel communication connection structure can utilize the fixed decoding function of the connection unit 11 to shorten the data reading and writing communication time between the PLC host 12 and the expansion machine 13 or 14 at a fixed sequence position, the parallel parallel communication The configuration of multiple expansion units, because the expansion units are configured in a fixed order with the fixed decoding function connection unit 11, the arrangement order of the expansion units is limited, and it is impossible to add expansion units at any time according to the use requirements or the selected position

Even when only one or a few expansion machines 13 are added to the PLC host 12, it is still necessary to purchase the entire fixed base 1 and its multiple connection units 11 with fixed decoding functions as connecting bridges, resulting in waste of cost

Images