Mitsumi electronic 55K, FR-F520-0.75K Computer programming Communication protocol, Data format

PARAMETERS

<Computer programming>

(1) Communication protocol

Data communication between the computer and inverter is performed using the following procedure:

Computer		Data read
↓	(Data flow)	*2	4)	5)
Inverter		1)			Time
Inverter		2)	3)
↓	(Data flow) *1

Computer

Data write

*1. If a data error is detected and a retry must be made, execute retry operation from the user program. The inverter comes to an alarm stop if the number of consecutive retries exceeds the parameter setting.

*2. On receipt of a data error occurrence, the inverter returns “reply data 3)” to the computer again. The

inverter comes to an alarm stop if the number of consecutive data errors reaches or exceeds the parameter setting.

(2) Communication operation presence/absence and data format types

Communication operation presence/absence and data format types are as follows:

			Run	Running	Parameter	Inverter	Monitor-	Para-
No.	Operation							meter
			Command	Frequency	Write	Reset	ing
								Read
	Communication request is sent to the
1)	inverter in accordance with the user		A’	A	A	A	B	B
	program.
2)	Inverter data processing time		Present	Present	Present	Absent	Present	Present
	Reply data from the	No error*	C	C	C	Absent	E	E
	inverter	(Request accepted)					E’
3)
	(Data 1) is checked for	With error	D	D	D	Absent	F	F
	error)	(request rejected)
4)	Computer processing delay time		Absent	Absent	Absent	Absent	Absent	Absent
	Answer from computer	No error*
		(No inverter	Absent	Absent	Absent	Absent	G	G
	in response to reply
		processing)
5)	data 3)
		With error
	(Data 3) is checked for
		(Inverter outputs 3)	Absent	Absent	Absent	Absent	H	H
	error)
		again.)
* In the communication request data given from the computer to the inverter, 10ms or more is also
required after "no data error (ACK)". (Refer to page 113)								4

(3) Data format

Hexadecimal data is used. Data is automatically transferred in ASCII between the computer and inverter.

•Data format types

1) Communication request data from computer to inverter

[Data write]

Format A

Format A'

[Data read]

Format B

	*3	Inverter		Instruction		*5							Sum
		station				Waiting			Data						*4
	ENQ	number			code	time							check
1		2	3	4	5	6	7	8	9		10		11	12	13 ← Number of characters
	*3	Inverter		Instruction		*5					Sum
		station				Waiting		Data					*4
	ENQ	number			code	time				check
1		2	3	4	5	6	7	8	9		10		11	← Number of characters
	*3	Inverter		Instruction		*5		Sum
		station				Waiting				*4
	ENQ	number			code	time		check
1		2	3	4	5	6	7	8	9			← Number of characters

111