NEWS ABOUT COMPANY OFFER SUPPLIERS TECHNICAL SUPPORT CAREER CONTACT News KNOWLEDGE BASE: Controlling the state of digital inputs in VFD-E series inverters after Modbus communication RETURN 2016-07-25 Controlling the state of digital inputs in VFD-E series inverters via Modbus communication \\ r \\ n \\ r \\ n Modbus communication protocol is one of the oldest communication protocols dedicated to applications in industrial automation systems. It was created by Modicon (now Schneider Electric) in 1979, but due to its numerous advantages, it has become a standard accepted by many manufacturers of automation devices. The protocol defines the rules for the exchange of information between two or more devices. Modbus ensures the fastest possible transfer of data while checking if they have not been corrupted. The organization of communication between devices is based on a simple principle that one master device (so-called Master) sends appropriate commands to other slave devices (Slave type). Such an organization organizes the rules for using the link, and in combination with error signaling, it protects against suspension of communication. \\ r \\ n \\ r \\ n Save digital outputs \\ r \\ n \\ r \\ n Some applications require use the least amount of wiring to use functions triggered by the digital inputs of the device. In this case, you can use the option of triggering digital input data after Modbus communication. This method saves the digital outputs of the control device and reduces the amount of wiring to a minimum. \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ nChanging the type of digital input \\ r \\ n \\ r \\ nFirst, change the status given MI input. By default, each of the inputs is of the External type, and in the inverter parameter 4.27 it is possible to change the type to Internal. By changing the input type to INTERNAL, it is possible to change the input state after communication, using the internal PLC, as well as from the digital panel keyboard. \\ r \\ n \\ r \\ n To change the status of a given input in parameter 4.27, enter a decimal value in accordance with the following scheme: \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n For example, to change the status of MI5 and MI6 inputs to INTERNAL, enter the value 2 ^ 4 2 ^ 5 = 16 to parameter 4.27 32 = 48. \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n Change of digital input state (ON / OFF) \\ r \\ n \\ r \\ n The state of the INTERNAL type input can be changed by changing the parameter 4.28. By entering the appropriate value (the figure below), we change the state of the given input. \\ r \\ n \\ r \\ n \\ r \\ n For example, to change the state of MI5 and MI6 inputs to ON, enter the value 2 ^ 4 2 ^ in parameter 4.28 5 = 16 32 = 48. \\ r \\ n \\ r \\ nIn addition, it is possible to change this parameter (i.e. change the state of digital inputs) while the inverter is running. \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ nCommunication \\ r \\ n \\ r \\ n ISPSoft software using the MODRW block. \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ nFill the function parameters as follows: \\ r \\ n \\ r \\ nS1 - address the device with which we want to connect \\ r \\ nS2 - modbus function code: 6- write one word \\ r \\ nS3 - modbus address of the register in which we want to enter the given \\ r \\ nS - register storing the data we want write \\ r \\ nn to the device - the number of registers that we want to write using the MODRW instruction \\ r \\ n \\ r \\ n To change the state of a given input, enter appropriate values into the inverter parameter 4.28. To obtain the corresponding modbus address, both parts of the parameter address should be changed to hexadecimal system. \\ r \\ n \\ r \\ n \\ r \\ n \\ r \\ n In place of S3, we enter 16 # 041c. By changing the value in the D100 register, we can change the states of the MI inputs (which have the INTERNAL status). \\ r \\ n \\ r \\ n For example, to control the state of the MI6 input, enter 32 (MI6 ON) or 0 (MI6 OFF) in D100. \\ r \\ n \\ r \\ n \\ r \ \ n \\ r \\ n \\ r \\ nAssign a function to a digital input \\ r \\ n \\ r \\ nYou can assign one of the available functions to a given digital input. Assignment of a function is done by entering the number corresponding to the given function into the parameters 04.05 ~ 04.08, which define the inputs MI3 ~ MI6. \\ r \\ n \\ r \\ n The list of available functions is presented in the table below: \\ r \\ n \\ r \\ n \\ r \\ n we can trigger the selected function without being physically connected to the digital input. \\ r \\ n \\ r \\ nAll the necessary information, a detailed description of the parameters and functions used can be found in the VFD-E operating manual. \\ r \\ n \ r \ n CONTACT Write to us InduProgress ul. Trakt Lubelski 404 04-667 Warsaw E-mail: biuro@induprogress.pl Phone: 22 290-31-78 Fax: +48 290-31-78 ext. 6 Service +48 22 290-31-78 ext. 4 serwis@induprogress.pl Technical assistance +48 22 290-31-78 ext. 3 pomoc@induprogress.pl We use cookies on our website. Using the website without changing your browser settings means that cookies will be placed on your device. 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