Based on the application of mitsubishi PLC no protocol communications

Based on the application of mitsubishi PLC controller no protocol communications summer rain bo sheng automation company welcome to visit e hall exhibition hall 3 PLC PLC programmable controller, PLC programming cable. 。 。 1 the introduction in the field of frequency converter and PLC integration application, usually need to according to field a variable automatic control frequency converter operation frequency. Textile processing humidification system is a typical example. In the design of the past, usually through the analog output module to control frequency converter operation frequency. But this method is expensive, and 4 - analog output module 20 ma current signal is vulnerable to outside interference. To this end, we in the application of mitsubishi series automation products, the use of mitsubishi PLCRS no protocol communication function to replace the analog module, the effect of getting twice the result with half the effort. Because the mitsubishi PLC is only one of the available programming, if you want to make an agreement, need to expand a 485 - PLC BD module. The module supports no protocol communications, parallel connection and network connection and other communication methods. In this paper we discuss no protocol communications between PLC and frequency converter application. 2 humidifier system scheme is widely used in textile industry, is the last link of textile technology, it will be pumped liquid after cutting into mist, spray evenly over the surface of the fabric such as cloth, mainly increase the luster of the piece goods, and flexibility. Its main electrical aspects of encoder, mitsubishi FX1N - 20MR,FX1N- 485 bd, HITECH man-machine, frequency converter, etc. It makes use of coder and PLC controller measurement cloth winding speed, and then according to the coiling of the fast speed to control the running frequency of frequency converter to control the flow of water pump, and spray control in the cloth fabric, such as the surface of the liquid volume. Through the RS485 - BD module without the agreement of the communication between PLC and frequency converter, according to the coiling speed how fast will automatically write operation frequency inverter. While the man-machine mainly complete system start, stop, parameter setting, etc. RS485 - BD module connection as shown in figure 1. FIG. 1 RS485 BD module wiring diagram 1, the communication line must use shielded twisted-pair cable, RS485 - BD side shielding wire must be grounded ( 100Ω) 。 R for the terminal resistance. RDA and RDB and SDA and resistance of 110 Ω (SDB Half duplex mode) 。 Details see 'FX series communications users manual'. 3 no protocol communications parameters set no protocol communications is mainly composed of a special data register D8120 set, specific Settings as shown in table. Schedule a special data register D8120 parameter set schedule: detailed explanations D8120-485 BD module USES manual. Specific reference to mitsubishi inverter FR - frequency converter parameters E500 manual. 4 communication program figure 2 for the mitsubishi FX series PLC and mitsubishi E series inverter communication program. RS no protocol communications instruction details please refer to 'FX hardware manuals and programming manual'. Figure 2 mitsubishi FX series PLC controller and mitsubishi E series inverter communication program introduced more than 5 conclusion without protocol implementation the basic ways of PLC and frequency converter communication and communication program. In actual application of this method has achieved good control effect, solved the problem of the analog susceptible to interference. Run interference problem has never happened. At the same time this method is easy to expand, when using more than one inverter, simply set frequency converter station number for different can better solve the problem of the analog channel is limited, the economic effect is obvious. Believe that this method will in automation system has been widely used in the design and equipment manufacturing. This article from 'PLC&FA'
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