Description
Overview
Essential details:IS200TPROS1CBB Gas turbine card module GE
PLC, as a high performance control device, has been more and more widely used in distributed systems. In this control mode, the upper monitor system is an important part of it. PLC can be a variety of ways such as direct use of the existing configuration monitoring software and the upper monitoring machine communication, but for small-scale control system, to find a high performance and price communication method,
1 Hardware description of the communication device
PLC and PC between the realization of the channel, can make the two complementary functions on the deficiency, PLC for control is convenient and reliable, and PC in graphic display, data processing, printing reports and Chinese display has a strong function. Therefore, the PLC manufacturers have developed various types of PLC and PC communication interface module applicable to the company. The FX-232AW interface module developed by Mitsubishi Corporation is used for FX2 series PLC to communicate with computers. There are also interface modules AJ71E71 connected to Ethernet, AJ71M51-S1 connected to MAP network, and AJ71M51M1 connected to FAIS MAP network. Different communication modes have different costs and prices and different scope of application. This paper introduces a method of communication between PC RS-232 port and PLC.
The programming interface of FX2 series PLC adopts RS-422 standard, and the serial interface of the computer adopts RS-232 standard. Therefore, as the interface circuit of PLC computer communication, the RS-422 standard must be converted into RS-232 standard.
RS-232 and RS-422 standard are different in signal transmission, logic and electrical average.
RS-232 uses a single-ended receiver and a single-ended transmitter to transmit information with only one signal line, and the logical “1” (-3 ~ -15V) and “0” (+3 ~ +15V) are determined according to the level of the signal line relative to the common signal ground level.
The RS-422 standard is a standard that transmits in a balanced manner, that is, double-ended transmit and double-ended receive, and determines the logical state based on the potential difference between the two transmission lines. The RS-422 circuit consists of a transmitter, a balanced connecting cable, a cable terminal load and a receiver. It converts logic levels and potential differences by balancing a transmitter and a differential receiver
MAX202 of MAXIM Company is used to realize the level conversion between RS-232 and TTL. MAX202 internal voltage doubling circuit and conversion circuit, only +5V power supply can work, very easy to use; MAX490 is used to realize the conversion between RS-485 and TTL. Each MAX490 piece has a pair of transmitter/receiver. Due to the full-duplex mode of communication, two pieces of MAX490 are needed, and only four external capacitors are needed.
PLC RS-422 interface is equipped with DB-25 connector, and the PC is generally used with DB-9 connector. The hardware circuit diagram is shown in Figure 1.
RS-232 RS, CS short connection, so that the computer to send data, PLC is always in the ready state. That is to say, the computer can send data to the PLC at any time. And because of the cross connection of DR And ER, so for the computer to receive data, it must wait until PLC is in the ready state.以上翻译结果来自有道神经网络翻译(YNMT)· 通用场景
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