General outlines of the communication function

E6581315

1. General outlines of the communication function

This manual explains the RS485 communication function provided for the TOSVERT VF-AS1 series of industrial inverters.

(1)RS485 communication by the use of a two-wire RS485 communication port (standard function)

(2)RS485 communication by the use of a four-wire RS485 communication port (standard function)

(1)2-wire RS485 communication connector

(2)4wire RS485 communication connector

By using these communication functions in combination with the computer link function designed to establish a link between a higher level computing machine or controller (hereinafter referred to as a computer) and each inverter on the network, or with the inter-drive communication function that al- lows proportional control of inverters without using a computer, you can set up a network for data communication between inverters.

There are two communication protocols available: Toshiba Inverter Protocol and MODBUS-RTU Protocol (this command does not support all commands). To select a protocol, the communication protocol selection parameter f807 or f829 is used. (Refer to Section 3. Communication proto- col.)

By preparing the program (explained later), the following information can be exchanged between the computer (host) and the inverter.

(1)Monitoring function (used to monitor the operating status of the inverter: Output frequency, current, voltage, etc.)

(2)Command function (used to issue run, stop and other commands to the inverter)

(3)Parameter function (used to set parameters and read their settings)

<Inter-drive communication function>

Master inverter sends the data, that is selected by the parameter, to all the slave inverters on the same network. This function allows a network construction in which a simple synchronous or proportional operation is possible among plural inverters (without the host computer).

As for data communication codes, the TOSVERT VF-AS1 series of inverters support the binary (HEX) code, in addition to the JIS (ASCII) code. A communication number is used to access the de- sired data item.

*The smallest unit of information that computers handle is called a “bit (binary digit),” which repre- sents the two numbers in the binary system: 1 or 0. A group of 16 bits is referred to as a “word,” which is the basic unit of information the VF-AS1 series of inverters use for data communication. One word can handle data items of 0 to FFFFH in hexadecimal notation (or 0 to 65535 in decimal notation).

BIT15

BIT8BIT7

BIT0

1 bit

1 word

RS485, VF-AS1 Series specifications

The Toshiba VF-AS1 Series represents a significant advancement in the realm of variable frequency drives (VFDs), designed for various industrial applications that demand precision, efficiency, and reliability. With support for RS485 communication, the VF-AS1 Series fosters seamless integration into complex automation systems, making it the perfect choice for modern manufacturing environments.

One of the standout features of the Toshiba VF-AS1 Series is its versatile communication capabilities. The built-in RS485 port allows for easy connectivity with a range of devices, including PLCs (Programmable Logic Controllers) and HMIs (Human-Machine Interfaces). This ensures real-time monitoring and control of motor functions, enhancing operational efficiency and data analysis.

The VF-AS1 Series is engineered with advanced control technologies that provide exceptional motor performance. It incorporates vector control algorithms that optimize torque and speed regulation for both standard and permanent magnet motors. This results in precise motor control across a wide range of speeds and load conditions, ensuring optimum performance and energy savings.

Another noteworthy characteristic is its user-friendly interface. The VF-AS1 features a clear LCD display that allows for easy navigation and configuration. This intuitive design minimizes the learning curve for operators and technicians, facilitating quick setup and adjustments. Additionally, the series supports various programming options, catering to both novice users and experienced professionals.

Energy efficiency is a key priority in the design of the VF-AS1 Series. The drives are equipped with energy-saving features that help reduce overall power consumption and operational costs. With built-in sleep modes and dynamic energy feedback, these drives optimize energy usage based on demand, making them suitable for both constant and variable load applications.

In terms of safety and protection, the VF-AS1 Series incorporates various built-in safeguards, including overvoltage, undervoltage, and overcurrent protection. This comprehensive approach to safety not only protects the drive itself but also ensures the longevity of connected equipment.

Overall, the Toshiba VF-AS1 Series, with its robust feature set, advanced technologies, and focus on energy efficiency, proves to be a reliable choice for a wide range of industrial applications. Its integration of RS485 communication allows for enhanced connectivity and control, making it an excellent solution for modern automation needs.

Toshiba RS485 General outlines of the communication function, BIT15 BIT8BIT7 BIT0, Bit Word

Models: RS485 VF-AS1 Series