Toshiba RS485 User Manual

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E6581315

TOSVERT VF-AS1 Series

RS485 Communication Function

Instruction Manual

Notice

1. Make sure that this instruction manual is delivered to the end user of the inverter.

2. Read this manual before first using the communications function, and keep it handy as a reference for maintenance and inspections.

* The contents of this manual are subject to change without notice.

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Read first

Safety precautions

This manual and labels on the inverter provide very important information that you should bear in mind to use the inverter properly and safely, and also to avoid injury to yourself and other people and damage to property.

Read the safety precautions in the instruction manual for your inverter before reading this manual and strictly follow the safety instructions given.

Notice	Reference

♦Insert an electromagnetic contactor between the inverter and the power supply so that Inverter instruction the machine can be stopped without fail from an external controller in case of an emermanual

gency.

♦Do not write the same parameter to the EEPROM more than 10,000 times. The life time Section 4.2 of EEPROM is approximately 10,000 times.(Some parameters are not limited, please “Commands” refer to the “9.Parameter data “)

When using the TOSHIBA inverter protocol and the data does not need to be records, use P command (the data is written only to RAM).

♦About the handling of the inverter, please follow the instruction manual of the inverter.

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Contents
1.	General outlines of the communication function.........................................................................................................	3
2.	Data transmission specifications ................................................................................................................................	4
3.	Communication protocol.............................................................................................................................................	5
	3.1. About the handling of received frames...............................................................................................................	5
4.	TOSHIBA Inverter Protocol.........................................................................................................................................	6
	4.1. Data transmission format ...................................................................................................................................	7
	4.1.1. Data transmission format used in ASCII mode.........................................................................................	7
	4.1.2. Data transmission format used in binary mode ......................................................................................	10
	4.1.3. Transmission format of Block Communication .......................................................................................	13
	4.2. Commands.......................................................................................................................................................	17
	4.3. Transmission errors .........................................................................................................................................	20
	4.4. Broadcast communication function ..................................................................................................................	21
	4.5. Examples of the use of communication commands.........................................................................................	23
	4.6. Examples of Communication programs ...........................................................................................................	24
5.	MODBUS-RTU protocol............................................................................................................................................	29
	5.1. MODBUS-RTU transmission format ..............................................................................................................	30
	5.1.1. Read command (03)...............................................................................................................................	30
	5.1.2. Write command (06)...............................................................................................................................	31
	5.2. CRC Generation...............................................................................................................................................	32
	5.3. Error codes.......................................................................................................................................................	32
6.	Inter-drive communication ........................................................................................................................................	33
	6.1. Proportional control of speed ...........................................................................................................................	37
	6.2. Transmission format for inter-drive communication .........................................................................................	39
7.	Communication parameters .....................................................................................................................................	40
	7.1. Baud rate( , ) , Parity ( ) ................................................................................................	42
	7.2. Inverter number( ).................................................................................................................................	42
	7.3. Communication time-out time ( ), Communication time-out action (f804) ...............................................................	43
	7.4. Send waiting time ( , ) ..............................................................................................................	44
	7.5. Free notes( ) .........................................................................................................................................	44
8.	Commands and monitoring from the computer ........................................................................................................	45
	8.1. Communication commands (commands from the computer) ..........................................................................	45
	8.2. Monitoring from the computer ..........................................................................................................................	49
	8.3. Utilizing panel (LEDs and keys) by communication .........................................................................................	58
	8.3.1. LED setting by communication ...............................................................................................................	58
	8.3.2. Key utilization by communication ...........................................................................................................	61
9.	Parameter data.........................................................................................................................................................	62
Appendix 1 Table of data codes........................................................................................................................................		67
Appendix 2 Response time ...............................................................................................................................................		68
Appendix 3 Compatibility with the communication function of the VF-A7 .........................................................................		69
Appendix 4 Troubleshooting .............................................................................................................................................		70
Appendix 5 Connecting for RS485 communication...........................................................................................................		71

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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 allows 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 protocol.)

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 desired data item.

*The smallest unit of information that computers handle is called a “bit (binary digit),” which represents 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

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2. Data transmission specifications

Items	Specifications

Transmission scheme	Half-duplex	*: Standard
Synchronization scheme	Start-stop synchronization	default setting
Communication baud rate	9600/19200/38400 bps (selectable using a parameter) 1
Communication protocol	TOSHIBA Inverter Protocol * / MODBUS-RTU (selectable using a parameter) *1
Character transmission	<ASCII mode> JIS X 0201 8-bit (ASCII)
	<Binary mode, MODBUS-RTU> Binary codes fixed to 8 bits
Stop bit length	Received by inverter: 1 bit, Sent by inverter: 2 bits *3
Error detecting scheme	Parity 2: Even /Odd/Non parity (selectable using a parameter) *1,
	checksum(Toshiba inverter protocol), CRC(MODBUS-RTU)
Character transmission	11-bit characters *1 (Stop bit=1, with parity)
format
Order of bit transmission	Low-order bits transmitted first
Frame length	Variable (to a maximum of 17 bytes)

*1: Changes to setting do not take effect until the inverter is turned back on or reset.

*2: JIS-X-0201 (ANSI)-compliant 8-bit codes are used for all messages transmitted in ASCII mode and vertical (even) parity bits specified by JIS-X-5001 are added to them. These even parity bits can be changed to odd parity bits by changing the parameter setting (a change to the parameter setting does not take effect until the inverter has been reset.)

*3: Here are the default character transmission format.

Characters received: 11 bits (1 start bit + 8 bits + 1 parity bit + 1 stop bit)

START									PARITY	STOP
BIT	BIT0	BIT1	BIT2	BIT3	BIT4	BIT5	BIT6	BIT7	BIT	BIT

The inverter receives one stop bit.

(The computer can be set so as to send 1, 1.5 or 2 stop bits.)

Characters sent: 12 bits (1 start bit + 8 bits + 1 parity bit + 2 stop bits)

START									PARITY	STOP	STOP
BIT	BIT0	BIT1	BIT2	BIT3	BIT4	BIT5	BIT6	BIT7	BIT	BIT	BIT

The inverter sends two stop bits.

(The computer can be set so as to receive 1, 1.5 or 2 stop bits.)

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3. Communication protocol

This communication protocol supports the TOSHIBA Inverter Protocol and part of MODBUS-RTU protocol.

Select the desired protocol from in the following communication protocol selection parameters ( , ).

“Parameter Name and , Communication Number. 0807 and 0829” Data Range: 0, 1 (Initial value: 0)

0:TOSHIBA (Includes inter-drive communication)

1:MOUBUS-RTU

*A parameter change is reflected when the inverter is reset, such as in power off.

3.1.About the handling of received frames

To send and receive data frames, a frame synchronization system for locating the start and end points of each frame is defined with time for which no data is sent (time interval equivalent to the time required to send 3.5 bytes of data).

If no data is sent for the time required to send 3.5 bytes of data at the current transmission speed (approx. 4 ms or more at 9,600 bps or approx. 2 ms or more at 19,200/38,400 bps) after receipt of a frame, the entire frame is assumed to have reached and information in it is analyzed. For this reason, an interval corresponding to at least 3.5 bytes of data must be placed between frames.

When sending a significant data set using two or more frames, an interval corresponding to at least 1.5 bytes of data must be placed between frames. If an interval corresponding to 1.5 bytes or more is not placed, the contents of a frame are analyzed separately from those of the other frames, and therefore communication are not carried out normally.

When two or more inverters on the same line are controlled individually one after another, not only data from the host computer to an inverter but also a response from an inverter to the host computer are transmitted to the other inverters on the line too. Therefore, an interval corresponding to at least 3.5 bytes should be placed between the time when the host computer receives a response from an inverter and the time when it sends a frame to the next inverter. Otherwise the return frame received and the frame that is sent immediately after receipt of the return frame will be recognized as one frame and communication will not be carried out normally.

[Correct]

	Frame A		Frame B
	Frame A

Note: An inverter cannot receive frame 3.5 bytes or more B before it finishes analyzing the

contents of frame A.

[Wrong] If divided into two smaller frames, frame A cannot be received as a single frame.

Frame A (1/2)	Frame A (2/2)	Frame B

1.5 bytes or more	Note: Correct if the interval corresponds

	to less than 1.5 bytes of data.

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4. TOSHIBA Inverter Protocol

Select “TOSHIBA” ( , = ) in the communication protocol selection parameters. “TOSHIBA” ( , = ) is set for initial communication protocol selection of shipment setting. (See “3. Communication protocol.”)

Exchange of data between the computer and the inverter

In communication between the computer and the VF-AS1 (hereinafter referred to as the inverter), the inverter is always placed in wait states and acts as a slave that operates on a request from the computer.

A discrimination between ASCII mode and binary mode is automatically made with the start code.

	Start code	“CR” (carriage return)
ASCII mode	“(”	Required
Binary mode	“2FH(/) ”	Not required

(1)If there is no transmission format or the inverter number that matches, an error occurs and no response is returned.

(2)When an inverter number is added behind the “(” communication will take place only in case of broadcast communication or if the number matches up with that assigned to the inverters.

(3)When a time-out period is specified with parameter f803 (communication time-out time), a time-out occurs if communication do not terminate normally within the specified time. With parameter f804 (communication time-out action), you can specify what the inverter should do if a time-out occurs. For details, refer to Section 7.3.

(4)On executing the command received, the inverter returns data to the computer. For the response time, see Appendix 2, “Response time.”

Note

Communication is not possible for about two seconds after the power is supplied to the inverter until the initial setting is completed. If the control power is shut down due to an instantaneous voltage drop, communication is temporarily interrupted.

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4.1. Data transmission format

Note: The term “trip status” used in this manual includes retry waiting status and trip retention status.

4.1.1. Data transmission format used in ASCII mode

A communication number is used to specify a data item, all data is written in hexadecimal, and JIS- X-0201 (ASCII (ANSI))-compliant transmission characters are used.

Computer → Inverter

Omissible in one-to-one communication

For the W and P commands only Omissible

(3.5bytes

"("

INV-NO

CMD

Communication No.

DATA

"&"

SUM

")"

(3.5bytes

Blank)

(28H)

2 bytes

1 byte

4 bytes

0 to 4 bytes

(26H)

2 bytes

(29H)

(0DH)

Blank)

Checksum area

Omissible

1. “(“ (1 byte)

: Start code in ASCII mode

2. INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communication) ... 00 (30H, 30H) to 99 (39H, 39h), *(2AH)

The command is executed only when the inverter number matches up with that specified using a parameter.

(When * is specified in broadcast communication, the inverter number is assumed to match if all numbers except * match. When * is specified instead of each digit (two-digit number), all inverters connected are assumed to match.)

If the inverter number does not match or if the inverter number is of one digit, the data will be judged invalid and no data will be returned.

3. CMD (1 byte)

: Command (For details, see the table below.)

4.Communication No.(4 bytes)

:Communication number (See 11, “Parameter data.”)

5.Data (0 to 4 bytes): Write data (valid for the W and P commands only)

6.	“&” (1 byte)	: Checksum discrimination code (omissible. When omitting this code, you also need to omit
		the checksum.)
7.	Sum (2 bytes)	: Checksum (omissible)
		Add the ASCII-coded value of the last two digits (4 bits/digit) of the sum of a series of bits
		(ASCII codes) from the start code to the checksum discrimination code.
		Ex.: (R0000&??) CR
		28H+52H+30H+30H+30H+30H+26H=160H
		The last two digits represent the checksum. = 60
		When omitting the checksum, you also need to omit the checksum discrimination
		code.
8.	“)” (1 byte)	: Stop code (omissible)
9.	CR (1 byte)	: Carriage return code

Details of commands and data

CMD (1 byte)	Write data (0 to 4 bytes) Hexadecimal number
R (52H): RAM read command	No data
W (57H): RAM/EEPROM write command	Write data (0 to FFFF)
P (50H) RAM write command	Write data (0 to FFFF)

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Inverter → computer

At time of broadcast communication, returning of data is not executed, except for the inverters to be returned, when the inverter number is not matched, and the inverter number has only one character. This is because there will be a risk of that the returned data may be deformed.

Data returned when data is processed normally (ASCII mode)

Omissible in one-to-one communication

Omissible

(3.5bytes

"("

INV-NO

CMD

Communication No.

DATA

"&"

SUM

")"

(3.5bytes

Blank)

(28H)

2 bytes

1 byte

4 bytes

0 to 4 bytes

(26H)

2 bytes

(29H)

(0DH)

Blank)

Checksum area

Omissible

1. “(“ (1 byte)

: Start code in ASCII mode

2. INV-NO (2 bytes)

: Inverter number (omitted if it is not found in the data received) ... 00 (30H, 30H) to 99 (39H,

39H)

If the inverter number matches up with that specified using a parameter, data will be return-

ed to the computer. In broadcast communication, only the destination inverter (with a num-

ber matching up with the smallest effective number) returns data to the computer.

In broadcast communication, no data is returned from any inverters except the inverter

bearing a number that matches up with the smallest effective number.

Ex.: (*2R0000) CR -> (02R00000000) CR)

Data is returned from the inverter with the number 2 only, but no data is returned from

inverters with the number 12, 22 ....

3. CMD (1 byte)

: Command ... The command is also used for a check when an inverter is tripped.

Under normal conditions... The uppercase letter R, W or P is returned, depending on the

command received: R, W or P command.

When an inverter is tripped... The lowercase letter r, w or p is returned, depending on the command received: R, W or P command.

(The command received is returned with 20H added to it.)

4.	Communication No.(4 bytes) :
		The communication number received is returned.
5.	Data (0 to 4 bytes): Data ... The data read in is returned for the R command, while the data received is returned
		for the W and P commands. If the data received is composed of less than 4 digits, it will be
		converted into 4-digit data and returned.
		Ex.: (W123412) CR → (W12340012) CR)
6.	“&” (1 byte)	: Checksum discrimination code (omitted if it is not found in the data received)
7.	Sum (2 bytes)	: Checksum ... Omitted if no checksum discrimination code is found in the data received.
		ASCII-coded value of the last two digits (4 bits/digit) of the sum of a series of bits (ASCII
		codes) from the start code to the checksum discrimination code.
8.	“)” (1 byte)	: Stop code (omitted if it is not found in the data received)
9.	CR (1 byte)	: Carriage return code

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• Data returned when data is not processed normally (ASCII mode)

In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type number is returned to the computer in addition to the checksum. At time of broadcast communication of the binary mode, returning of data is not executed except for the inverter to be returned (inverter number 00H) and when the inverter number is not matched. This is because there will be a risk that the returned data may be deformed.

Omissible Omissible

(3.5bytes	“(“	INV-NO	“N” or “n”	DATA	"&"	SUM	")"	CR	(3.5bytes
Blank)	(28H)	2 bytes	(4EH) (6EH)	4 bytes	(26H)	2 bytes	(29H)	(0DH)	Blank)
		Checksum area

Omissible

“(“ (1 byte)	: Start code in ASCII mode
“N” or “n” (1 byte)	:Communication error command ... This is also used for the checking of inverter trip.
	“N” for the normal communication and “n” during the inverter trip.
INV-NO (2 bytes)	: Inverter number (omitted if it is not found in the data received) ... 00 (30H, 30H) to 99 (39H,
	39H)
	If the inverter number matches up with that specified using a parameter, data will be return-
	ed to the computer. In broadcast communication, only the destination inverter (with a num-
	ber matching up with the smallest effective number) returns data to the computer.
Data (4 bytes)	: Error code (0000~0004)
	0000 ... Impossible to execute (Although communication is established normally, the
	command cannot be executed because it is to write data into a parameter whose
	setting cannot be changed during operation (e.g., maximum frequency) or the
	EEPROM is faulty.)
	0001 ... Data error (The data is outside the specified range or it is composed of too many
	digits.)
	0002 ... Communication number error (There is no communication number that matches.)
	0003 ... Command error (There is no command that matches.)
	0004 ... Checksum error (The checksum result differs.)
“)” (1 byte)	: Stop code ... This code is omitted if it is not found in the data received.

Examples:

(N0000&5C)CR... Impossible to execute (e.g., a change of maximum frequency data during operation)

(N0001&5D)CR... Data error (Data is outside the specified range.)

(N0002&5E)CR... No communication number (There is no communication number that matches.) (N0003&5F)CR... There is no command that matches. (Commands other than the R, W and P

commands)

(Ex.: L, S, G, a, b, m, r, t, w ...) (N0004&60)CR... Checksum error (The checksum result differs.) No data returned ... Format error or invalid inverter number

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4.1.2. Data transmission format used in binary mode

A communication number is used to specify a data item, data is written in hexadecimal form, and data in transmission characters are represented by binary codes (HEX codes).

Computer → Inverter (binary mode)

Omissible in one-to-one communication No data for the 52H (R) command

(3.5bytes	“/”	INV-NO	CMD		Communication No.	DATA	SUM	(3.5bytes
Blank)	(2FH)	1 byte	1 byte		2 bytes	2 bytes	1 byte	Blank)
				Checksum area		Not omissible

1. 2FH (“/”) (1 byte) : Start code in binary mode

2. INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communication) ... 00H to 3FH ,FFH

	In case the inverter number is other than FFH (broadcast communication), command is ex-
	ecuted only when the inverter number coincides with the one designated with the panel. If
	the inverter number is not matched, it will be judged invalid and the data is not returned.
3. CMD (1 byte)	: Command (For details, see the table below.)
	52H (R) command: The size of the data following CMD is fixed to 3 bytes. (Communication
	number: 2 bytes, checksum: 1 byte)
	57H (W), 50H (P) and 47H (G) commands: The size of the data following CMD is fixed to 5
	bytes.
	(Communication number: 2 bytes, data: 2 byte, checksum: 1 byte)
	Any command other than the above is rejected and no error code is returned.

4.Communication No.(2 bytes)

:Communication number (See 11, “Parameter data.”)

5. Data (2 bytes)	: 0000H to FFFFH
	57H	(W) and 50H (P) commands: Write data (An area check is performed.)
	47H	(G) command: Dummy data (e.g., 0000) is needed.
	52H	(R) command: Any data is judged invalid. (No data should be added.)
6. Sum (2 bytes)	: Checksum (not omissible) 00H to FFH
	Value of the last two digits (1 byte) of the sum of a series of bits (codes) from the start code
	of the data returned to the data (or to the communication number for the 52H (R) com-
	mand)
	Ex.: 2F 52 00 ?? ... 2FH+52H+00H+00H=81H
	The last two digits (??) represent the checksum= 81

Details of commands and data

CMD (1 byte)		Write data (2 bytes) Hexadecimal number
52H	(R): RAM read command	No data
57H	(W): RAM/EEPROM write command	Write data (0000H to FFFFH)
50H	(P): RAM write command	Write data (0000H to FFFFH)
47H	(G): RAM read command (for two-wire networks)	Dummy data (0000H to FFFFH)

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Inverter → computer (binary mode)

At time of broadcast communication of the binary mode, returning of data is not executed except for the inverter to be returned (inverter number 00H) and when the inverter number is not matched. This is because there will be a risk that the returned data may be deformed.

• Data returned when data is processed normally (Binary mode)

Omissible

(3.5bytes	“/”	INV-NO	CMD		Communication No.	DATA	SUM	(3.5bytes
Blank)	(2FH)	1 byte	1 byte		2 bytes	2 bytes	1 byte	Blank)
				Checksum area		Not omissible

1. 2FH (“/“) (1 byte) : Start code in binary mode

2. INV-NO (2 bytes) : Inverter number... 00H to 3FH (The inverter number is omitted if it is not found in the data received.)

If the inverter number matches up with that specified from the operation panel, data will be returned from the inverter. If the inverter number does not match, the data will be invalid and no data will be returned.

3. CMD (1 byte)	: Command...The command is also used for a check when the inverter is tripped.
	Under normal conditions...52H (R), 47H (G), 57H (W) or 50H (P) is returned, depending on
	the command received.
	When the inverter is tripped...The lowercase letter 72H (r), 67H (g), 77H (w) or 70H (p) is
	returned with 20H added to it, depending on the command received.

4.Communication No. (4 bytes)

:The communication number received is returned.

5. Data (2 bytes)	: Data ... 0000H to FFFFH
	The data read is returned for the 52H (R) and 47H (G) commands, while the data written is
	returned for the 57H (W) and 50H (P) commands.
6. Sum (1 bytes)	: Checksum (not omissible) 00H to FFH
	Value of the last two digits (1 byte) of the sum of a series of bits (codes) from the start code
	to the data.

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2) Error Processing (Binary mode)

Omissible

(3.5bytes

“/”

INV-NO

Norn

DATA

SUM

(3.5bytes

Blank)

(2FH)

1 byte

(4EH)(6EH)

2 bytes

1 byte

Blank)

Checksum area Not omissible

Norn (1 byte)

: Communication error command ... This command is also used for a check when the in-

verter is tripped.

“4EH (N)” is returned under normal conditions, while “6EH (n)” is returned when the in-

verter is tripped.

Data (2 bytes)

: Error code (0000~0004)

0000

... Impossible to execute (Although communication is established normally, the com-

mand cannot be executed because it is to write data into a parameter whose set-

ting cannot be changed during operation (e.g., maximum frequency) or the

EEPROM is faulty.)

0001

... Data error (The data is outside the specified range or it is composed of too many

digits.)

0002

... Communication number error (There is no communication number that matches.)

0004

... Checksum error (The checksum result differs.)

No code returned ...Command error, format error (failure to receive the specified number of bytes within 0.5 seconds, or an parity, overrun or framing error) or the inverter number does not match or an inverter in broadcast communication in the binary mode except for the inverter for data returning (the inverter numbered 00H).

Examples:

2FH, 4EH, 00H, 00H, 7DH ... Impossible to execute (e.g., a change of maximum frequency data during operation)

2FH, 4EH, 00H, 01H, 7EH ... Data setting error (The data specified falls outside the specified range.)

2FH, 4EH, 00H, 02H, 7FH ... No communication number (There is no communication number that matches.)

2FH, 4EH, 00H, 04H, 81H ... Checksum error (The checksum result differs.)

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4.1.3. Transmission format of Block Communication

What is block communication?

Data can be written in and read from several data groups set in one communication by setting the type of data desired for communication in the block communication parameters ( , ,to ) in advance. Block communication can save the communication time.

Data is transmitted hexadecimal using the binary (HEX) code transmission characters. “Computer

→inverter” is for writing only, while “Inverter → computer” for reply is for reading only.

Computer → Inverter (Block Communication)

Omissible

Number of writing data groups x 2 bytes

(3.5bytes

Start

INV-NO

CMD

Num-

Write

SUM

(3.5bytes

Blank)

Code

“X”

ber of

data1

data2

Blank)

“ ”

write

read

High

Low

High

Low

data

groups

Checksum Area

1.2FH(“/”) (1 byte) : Start code of binary mode

2.INV-NO (1 byte) : Inverter number. (Can be omitted in 1:1 communication): 00H to 3FH, FFH

Executed only when the inverter number matches the inverter number. Set on the panel, except in FFH (broadcast communication).

Communication data will be invalidated and data will not be returned either if the inverter number. Does not match.

3. CMD (1 byte) : ‘X’ (Block communication command)

4.Number of write data groups (1 byte)

:Specify the number of data groups to be written (00H to 02H).

If specified outside of the range, data will be treated as a format error and data will not be returned.

5.Number of read data groups (1 byte)

:Specify the number of data groups to be read (00H to 05H).

If specified outside of the range, data will be returned as “Number of read data groups = 0” when returned by the inverter.

6.Write data1 (2 bytes)

:Needed when the number of write data groups is larger than 1. Data to be written to the specified parameter selected by

Dummy data is needed if the number of write data groups is larger than 1 even though(none) is selected for

7.Write data2 (2 bytes)

:Needed when the number of write data groups is 2.

Data to be written to the specified parameter selected by

Dummy data is needed if the number of write data groups is 2 even though(none) is selected for

8. SUM (1 byte) : Checksum (Cannot be omitted) 00H to FFH

Lower two digits (1 byte) of total sum from start code (SUM value not included)

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Block Write 1, 2

Select data, which is desired to be written in block communication, in block write Data 1 and 2 Parameters ( , ). This parameter becomes effective when the system is reset, such as when power is turned off. When the setting is completed, turn off and then on the power.

No.	Block Write Data	For data details, see:
0	Deselect
1	Command information 1 (FA00)
2	Command information 2 (FA20)
3	Frequency Command (FA01)	“8.1 Command by communication”
4	Terminal board output data (FA50)
5	Communication analog output (FA51)

*When “Deselect” is specified in the parameters, no data will be written even though write data is specified.

Block Read 1 to 5

Select read data, which is desired to be read in block communication, in block read data 1 and 5 Parameters ( to ). This parameter becomes effective when the system is reset, such as when power is turned off. When the setting is completed, turn off and then on the power.

No.	Block Read Data	For data details, see:
0	Deselect
1	Status information (FD01)
2	Output frequency (FD00)
3	Output current (FD03)
4	Output voltage (FD05)
5	Alarm Information (FC91)
6	PID feedback value (FD22)
7	Input terminal board monitor (FD06)	“8.2 Monitoring from communication”
8	Output terminal board monitor (FD07)	“8.2 Monitoring from communication”
8	Output terminal board monitor (FD07)
9	V/II terminal boad monitor (FE36)
10	RR/S4 terminal board monitor (FE35)
11	RX terminal board monitor (FE37)
12	Input voltage (DC detection) (FD04)
13	Speed feedback frequency (FD16)
14	Torque (FD18)
15	My monitor 1(FE60)
16	My monitor 2(FE61)
17	My monitor 3(FE62)
18	My monitor 4(FE63)
19	Free notes (F880)	“7.5 Free notes ( )”

*V/II terminal board monitor (FE36), RR/S4 terminal board monitor (FE35) and RX terminal board monitor (FE37) will become hold data during a trip. Otherwise, real-time data appears.

*“0000” will be returned as dummy data, if “0 (Deselect)” is selected for the parameter and “read” is specified.

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Inverter → Computer

1) Normal processing

Omissible

Number of read data groups x 2 bytes

(3.5

Start

INV

CMD

Number

Write

Read

SUM

(3.5

bytes

Code

No.

“Y”

of Read

Status

data1

data2

data3

data4

data5

bytes

Blank)

“/”

Data

high

low

high

low

high

low

high

low

high

low

Blank)

Groups

Checksum area

1.2FH “/” (1 byte) Start code in binary mode

2.INV-NO (1Byte) Inverter number 00H to 3FH

If the inverter number matches up with that specified from the operation panel, data will be returned from the inverter. If the inverter number does not match, the data will be judged invalid and no data will be returned.

Communication data will be invalidated and data will not be returned either if the inverter number does not match. (Inverter number is considered matched if it is omitted during reception)

3. CMD(1Byte)	:‘Y’ (Block communication command [monitoring])
	Lowercase letter ‘y’ during an inverter trip, including standing by for retrying and during

atrip.

4.Number of read data groups (1 byte)

:Return the number of data groups to be read (00H to 05H).

5. Write status (1 byte) : Return 00H to 03H.

* Failing to write in the specified parameter in the number of write data groups, set “1” in the corresponding bit for the parameter failed to write. (See below.)

Bit Position	7	6	5		4	3	2	1	0
Data Type

6.Read data1 - 5 (2 bytes)

:Return according to the number of read data groups. “0000H” is returned as dummy

data if “0” is selected as a parameter.

Read data1: Data selected by . Read data2: Data selected by .

	Read data3: Data selected by . Read data4: Data selected by .
	Read data5: Data selected by .
7.SUM(1Byte)	: Checksum (Cannot be omitted) 00H to FFH
	Lower two digits (1 byte) of total sum from start code of return data to read data.

Example

(When set as follows: = (Command information 1), = (frequency command),

= (status information), = (output frequency), = (output current), = (output voltage) and = (alarm information)

Computer → Inverter 2F 58 02 05 C4 00 17 70 D9

Inverter → Computer 2F 59 05 03 00 00 00 00 00 00 00 00 00 00 90 (When parameter is not set) Inverter → Computer 2F 59 05 00 40 00 00 00 00 00 00 00 00 00 CD CD (When parameter is set) Inverter → Computer 2F 59 05 00 64 00 17 70 1A 8A 24 FD 00 00 3D (During operation at 60Hz)

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2) Error Processing (Binary mode)

In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type number is returned to the computer in addition to the checksum.

Omissible

(3.5bytes

“/”

INV-NO

Norn

DATA

SUM

(3.5bytes

Blank)

(2FH)

1 byte

(4EH)(6EH)

2 bytes

1 byte

Blank)

Checksum area Not omissible

“N” or “n” (1 byte)

: Communication error command.

Also for check during an inverter trip (includes standing

by for retrying and trip holding). “4EH (N)” when normal, “6EH (n)” during an inverter trip.

DATA (2 bytes)

: Error code (0004)

0004

: Checksum error (The checksum does not match)

No return : Command error, format error (specified number of bytes is not received in 1sec,

or parity error, overrun error or framing error), inverter number mismatch, and

inverter number other than 00H in broadcast communication.

Examples

Computer → Inverter

: 2F 58 02 05 C4 00 17 70 D8

Inverter → Computer

: 2F 4E 00 04 81 ... Checksum error

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4.2. Commands

Here are the communication commands available.

	Command	Function
	R command	Reads the data with the specified communication number.
	W command	Writes the data with the specified communication number. (RAM and EEPROM).
	P command	Writes the data with the specified communication number. (RAM).
	G command	Reads the data with the specified communication number. (For binary mode only.
	G command	Dummy data is required for this command.)
		Dummy data is required for this command.)
	X command	Block communication (Computer -> Inverter)
	Y command	Block communication (Inverter -> Computer)

W (57H) (RAM*1 /EEPROM*2 write)

This command is used to write new data into the parameter specified using it communication number. It writes data into the RAM and EEPROM. For parameters whose settings cannot be stored in the EEPROM (e.g., parameter with the communication number FA00), the W (57H) command writes data into the RAM only. It cannot be used to write data into read-only parameters (e.g., parameter with the communication number FD?? or FE??).

Each time an attempt to write data is made, the inverter checks if the data falls within the specified range. If this check reveals that the data falls outside the specified range, the inverter will reject it and return an error code.

- Ex.: Setting the deceleration time (communication number: 0010) to 10 sec.

<ASCII mode>		CR: Carriage return
Computer → Inverter	Inverter → Computer
(W00100064)CR	(W00100064)CR	…(10÷0.1=100=0064H)
<Binary mode>
Computer → Inverter	Inverter → Computer
2F 57 00 10 00 64 FA	2F 57 00 10 00 64 FA	…(10÷0.1=100=0064H)

Notice

♦Do not write the same parameter to the EEPROM more than 10,000 times. The life time of EEPROM is approximately 10,000 times.(Some parameters are not limited, please refer to the “9.Parameter data “) The lifetime of EEPROM is approximately 10,000 times. When using the TOSHIBA inverter protocol and the data does not need to be records, use P command (the data is written only to RAM).

Explanation of terms

*1: The RAM is used to temporarily store inverter operation data. Data stored in the RAM is cleared when the inverter is turned off, and data stored in the EEPROM is copied to the RAM when the inverter is turned back on.

*2: The EEPROM is used to store inverter operation parameter settings, and so on. Data stored in the EEPROM is retained even after the power is turned off, and it is copied to the RAM when the inverter is turned on or reset.

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P (50H) (RAM*1 write)

This command is used to rewrite data into the parameter specified using a communication number. It writes data into the RAM only. It cannot be used to write data into any read-only parameters. Each time an attempt to write data is made the inverter checks whether the data falls within the specified range. If this check reveals that the data falls outside the range, the inverter will reject it and return an error code.

- Ex.: Entering the emergency stop command (communication number: FA00) from the computer

<ASCII mode>
Computer → Inverter	Inverter → Computer
(PFA009000)CR	(PFA009000)CR	…Command priority, emergency stop
		command
<Binary mode>
Computer → Inverter	Inverter → Computer
2F 50 FA 00 90 00 09	2F 50 FA 00 90 00 09

R (52H) (Data read)

This command is used to read the setting of the parameter specified using a communication number.

- Ex.: Monitoring the electric current (communication number: FE03) <ASCII mode>

Computer → Inverter	Inverter → Computer
(RFE03)CR	(RFE03077B)CR	…Current: 1915 / 100 = 19.15%
<Binary mode>
Computer → Inverter	Inverter → Computer
2F 52 FE 03 82	2F 52 FE 03 07 7B 04

G (47H) (Data read)

This command is used to read the parameter data specified using a communication number. Although this command is used for the previous model to control the operation of two or more inverters in binary mode through a two-wire RS485 network, the “R” command can also be used without problems for the VF-AS1 series.

To use the “G” command, however, dummy data (2 bytes) is needed. This command is available only in binary mode.

- Ex.: Monitoring the electric current (communication number: FE03)

Computer → Inverter	Inverter → Computer
2F 47 FE 03 00 00 77	2F 47 FE 03 07 7B F9

*In this example, the data 00H sent from the computer to the inverter is dummy data.

S (53 H)/ s (73 H) Inter-drive communication command(RAM*1 Write)

This command is for using frequency command values in % (1 = 0.01%), instead of in Hz, and is for synchronous-proportional operation in inter-drive communication. This command can also be used in ordinary computer link communication.

When writing in the frequency command (FA01, FA05) is enabled and a parameter other than it is specified, a communication number error will result. Data is written in the RAM only and at this time the data check such as an upper limit and lower limit checking is not carried out.

Data is not returned from the inverters while this command is used. This command can be used only in the binary mode.

For the details of the format, see “6.2 Transmission format for inter-drive communication.”

Use (%) as the unit for frequency command values specified by the command S, instead of (Hz), and the receiving side converts units for frequency values to “Hz” in accordance with the point conversion parameter. The conversion formula is shown below.

Frequency command value (Hz) =

Point 2 frequency (F813) − Point 1 frequency (F812)

Point 2 (F814) − Point 1 (F811) − Point 1 (F811) + Point 1 frequency (F812)

x (Frequency command value (%)

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When Command “s” (lowercase letter) is received, the slave side judges that the master side is tripped and operates in accordance with the inter-drive communication parameter ( ,

For detail, see "7. Communication parameters ".

- Examples: 50% frequency command (2-wire RS485 communication)

(If maximum frequency = Frequency for operation at 80Hz = 40Hz: 50% = 5000d = 1388H)

<Binary mode>
Master inverter → Slave inverter	Slave inverter → Master inverter
2F 53 FA 01 13 88 18	No return

X(58H)/Y (59H) (Block Communication Command)

Data selected in the block communication write parameters ( , ) is written in the RAM. When returning data, data selected in block communication read parameters ( to) is read and is returned.

For detail, see "4.1.3. Transmission format of Block Communication ".

- Examples: 60Hz operation command from communication and monitoring (Monitoring when already operating at 60Hz)

(Parameter Setting: = , = , = , = , = , =, = )

<Binary mode>
Computer → Inverter	Inverter → Computer
2F 58 02 05 C4 00 17 70 D9	2F 59 05 00 64 00 17 70 1A 8A 24 FD 00 00 3D

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4.3. Transmission errors
Table of error codes

Error name			Description	Error code

Impossible to	exe-	The command is impossible to execute, though communication was		0000
cute		established normally.
		1 Writing data into a parameter whose setting cannot be changed
		during operation (e.g., maximum frequency) *1
		2 Writing data into a parameter while “ ” is in progress
Data error		Invalid data is specified.		0001
Communication		There is no communication number that matches.		0002
number error
Command error		The command specified does not exist.		0003 (ASCII mode)
				No code returned (Binary
				mode)
Checksum error		The Checksum does not match.		0004
Format error		The data transmission format does not match.		No code returned
		1 One-digit inverter number (ASCII mode)
		2 The CR code is found in the designated position. (ASCII mode)
		Ex.:Communication number of 4 digit or less. In the case of (R11)
		CR, 11) CR is recognized as a communication number and
		the CR code is not recognized, with the result that a format
		error occurs.
		3 A code other then the stop code (“)”) is entered in the stop code
		position.
Receiving error		A parity, overrun or framing error has occurred. *2		No code returned
	*1: For parameters whose settings cannot changed during operation, see ”Table of parameters.”
	*2: Parity error		: The parity does not match.
		Overrun error	: A new data item is entered while the data is being read.

Framing error : The stop bit is placed in the wrong position.

*For the errors with “no code returned” in the above table, no error code is returned to avoid a data crash.

If no response is received, the computer side recognizes that a communication error has occurred. Retry after a lapse of some time.

*If the inverter number does not match, no processing will be carried out and no data will be returned, though it is not regarded as an error.

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4.4. Broadcast communication function

Broadcast communication function can transmit the command (write the data) to multiple inverters by one communication. Only the write (W, P) command is valid and the read (R, G) command is invalid. The inverters subject to the broadcast communication are the same to the independent communication; 0 to 99 (00H - 63H) in the ASCII mode, and 0 to 63 (00H - 3FH) in the binary mode. To avoid data deforming, the inverters to return data will be limited.

“Overall” broadcast communication (ASCII mode / Binary mode)

- ASCII Mode

If you enter two asterisks (**) in the inverter number position of the data transmission format, the computer will send the data simultaneously to all inverters (with an inverter number between 0 and 99 (00 to 63H)) on the network.

- Binary Mode

To put "FF" to the specified place of the inverter number in the communication format validates the broadcast communication and the command is transmitted to all the applicable inverters in the network (inverter numbers from 0 to 63 (00 to 3FH)).

Data is returned from the inverter bearing the inverter number 00 only.

If you do not want inverters to return data, do not assign the number 00 to any inverter on the network.

“Group” broadcast communication (ASCII mode only)

If you put “*?” In the inverter number position of the data transmission format, data will be sent simultaneously to all inverters bearing a number whose digit in the one’s place in decimal notation is”?”

If you put ”?*” In the inverter number position of the data transmission format, the data will be sent simultaneously to all inverters bearing a number whose digit in the ten’s place in decimal notation is”?”.

(“?”: Any number between 0 and 9.)

Data is returned only from the inverter bearing the smallest number in the same group of inverters (i.e., inverter whose number in the position of ”*” is 0).

If you do not want inverters to return data to the computer, do not assign a number having a 0 in the position of “*” to any inverter on the network.)

Examples of broadcast communication

Ex: Set the frequency setting for communication to 60Hz.

1Host computer → Multiple inverters: broadcast communication (ASCII Mode) Example of transmission of data from host computer to inverter: (**PFA011770)CR Example of data returned from inverter to host computer: (00PFA011770)CR

Data is returned from the inverter numbered 00 only, while commands are issued to all inverters connected to the network.

2Host computer → A specific group of inverters: group communication (ASCII Mode) Example of transmission of data from host computer to inverters: (*9PFA011770)CR Example of data returned from inverter to host computer: (09PFA011770)CR

Data is returned only the inverter numbered 09 only, while commands are issued to a maximum of 10 inverters bearing the number 09, 19, 29, 39, ... or 99.

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