Mitsubishi Electronics FR-S500 Computer programming Communication protocol, Operation Run, Ing

Communication 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
Inverter		1)		4) 5)	Time
Inverter		2)		3)
	(Data flow)	*1
			Data write
Computer

REMARKS

*1. If a data error is detected and a retry must be made, execute retry operation with 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:

No.	Operation		Run	Running	Parameter	Inverter	Monitor-	Parame-
			Command Frequency		Write	Reset	ing	ter Read
	Communication request
1)	is sent to the inverter in		A'	A (A")*1	A (A")*2	A	B	B
	accordance with the
	user program in the
	computer.
2)	Inverter data processing		Present	Present	Present	Absent	Present	Present
	time
	Reply data	No error*					E, E'	E
	from the	(Request	C	C	C	Absent
							(E")*1	(E")*2
3)	inverter.(Da	accepted)
	ta 1) is
		With error	D	D	D	Absent	F	F
	checked for	(request
	error)	rejected)
4)	Computer	processing	Absent	Absent	Absent	Absent	Absent	Absent
	delay time
	Answer	No error*					G	G
	from	(No inverter	Absent	Absent	Absent	Absent
							(Absent)	(Absent)
	computer in	processing)
5)	response to
		With error.
	reply data
	3). (Data 3)	(Inverter	Absent	Absent	Absent	Absent	H	H
	is checked	outputs 3)
	for error)	again.)

*In the communication request data from the computer to the inverter, 10ms or more is also required after "no data error (ACK)". (Refer to page 137.)

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