General Outlines Of The Communications Function - Toshiba TOSVERT VF-FS1 Instruction Manual

1. General outlines of the communications function

This manual explains the serial communications interface function provided for the TOSVERT
VF-FS1 series of industrial inverters.
The TOSVERT VF-FS1 series of inverters can be connected to a computer or a controller (herein-
after referred to as the computer) for data communications via USB converter (USB001Z).
By writing computer programs, you can monitor the operating status of the inverter, control its op-
eration in various ways from the computer, and change and store parameter settings on storage
devices.
The communication protocol is preparing the TOSHIBA Inverter Protocol and the MODBUS-RTU
protocol. Please choose selection of a protocol with a communication protocol selection parameter
(
<Computer link>
By preparing the program (explained later), the following information can be exchanged between
the computer (host) and the inverter.
• Monitoring function (used to monitor the operating status of the inverter: Output frequency,
current, voltage, etc.)
• Command function (used to issue run, stop and other commands to the inverter)
• 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 propor-
tional operation is possible among plural inverters (without the host computer).
As for data communications codes, the TOSVERT VF-FS1 series of inverters support the binary
(HEX) code, in addition to the JIS (ASCII) code. The communications function is designed on the
assumption that the JIS (ASCII) code is used for communications between the inverter and the
personal computer, and the binary (HEX) code for communications between the inverter and the
microcomputer built into the controller. A communication number is used to access the desired 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-FS1 series of inverters use for data communications.
One word can handle data items of 0 to FFFFH in hexadecimal notation (or 0 to 65535 in decimal
notation).
).
BIT15 BIT8 BIT7
1 word
3
E6581393
BIT0
1 bit