INTRODUCTION In modern industrial control systems, the combined application of plc and frequency converters is most common. The more traditional application is to use the output contact of the PLC to drive the intermediate relay to control the start, stop or multi-speed of the inverter; the more accurate one is to continuously control the operation of the inverter or multiple units by PLC plus D/A expansion module. Synchronous operation between inverters. However, for large-scale automated production lines, on the one hand, the number of inverters is large, and on the other hand, the distances of motor distribution are inconsistent Synchronous motion control using the D/A expansion module is susceptible to fluctuations in analog signals and inconsistent attenuation of analog signals due to inconsistent distances, resulting in reduced operational stability and reliability of the overall system. With RS-485 communication control, only one communication cable can be connected to complete the start, stop and frequency setting of the inverter; and it is easy to realize synchronous operation between multiple motors. The system has low cost, long signal transmission distance and strong anti-interference.
The hardware composition of the two systems and the hardware components of the connection system are shown in Figure 1. They are mainly composed of the following components;
Figure 1: System hardware components
1. FX2N-32MT-001 is the core component of the system.
2. FX2N-485-BD is the communication adapter of FX2N system PLC. It is mainly used for transmitting and receiving data between PLC and inverter.
3. The SC09 cable is used for data transfer between the PLC and the computer.
4. The communication cable is made by five-core cable.
The following describes how to make communication cables and how to connect them:
The terminal block of the PU interface of the inverter for RS485 communication is defined as shown in Figure 2: (from below the inverter)
Figure 2: Inverter interface terminal block definition Figure 3: Communication connection between PLC and inverter
The user defines one end of the five-core cable as shown in Figure 3 to connect to the FX2N-485BD, and the other end (Figure 2) uses a dedicated interface to crimp the five-core cable to the PU port of the inverter. (Remove the FR-DU04 panel)
485 communication protocol and data definition between three PLCs and inverters
Communication between the PLC and the inverter, the communication specifications must be set in the initialization of the inverter. If there is no setting or an incorrect setting, the data will not be able to communicate. And after each parameter setting, you need to reset the inverter. Make sure the parameter settings are in effect. After the parameters are set, the data communication will be carried out according to the following protocol. (Figure 4)
Figure 4: RS485 communication protocol diagram
1 Communication request data from PLC to inverter
2 Response data from the inverter to the PLC when data is written
3 Response data from the inverter to the PLC when reading data
4 Send data from PLC to inverter when reading data
The communication data is defined as follows:
1 control code
2 Communication data type All instruction codes and data are sent and received in ASCII code (hexadecimal). For example: (frequency and parameters) determine the definition and setting range of the data according to the corresponding instruction code.
Four software design To realize the communication control of the PLC to the inverter, the PLC must be programmed; through the program, the PLC can control the operation of the inverter and collect the data. The PLC program should first complete the initialization of the FX2N-485BD communication adapter, the combination of control command words, code conversion and the processing of the inverter response data. The design flow of the PLC communication running program is as shown in Figure 5:
Figure 5: PLC communication flow chart
The PLC controls the inverter running program example through RS-485 communication: (in the form of instruction list).
0 LD M8002
1 MOV H0C96 D8120
6 LD X001
7 RS D10 D26 D30 D49
16 LD M8000
17 OUT M8161
19 LD X001
20 MOV H5 D10
25 MOV H30 D11
30 MOV H31 D12
35 MOV H46 D13
40 MOV H41 D14
45 MOV H31 D15
50 MPS
51 ANI X003
52 MOV H30 D16
57 MPP
58 ANI X003
59 MOV H34 D17
64 LDP X002
66 CCD D11 D28 K7
73 ASCI D28 D18 K2
80 MOV K10 D26
85 MOV K0 D49
90 SET M8122
92 END
When the above program is running, the PLC will start to change the inverter through the RS-485 communication program, and the stop will be controlled by the X3 terminal. Control instructions are as follows
V. Conclusion This paper discusses the programming and application of Mitsubishi PLC's RS-485 communication function with its inverter through examples, which helps readers to further research and application. It is easy to connect with Mitsubishi's F900 series touch show. . It will further expand the flexibility of the application.
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