Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 401 / 608

Parameter Communication operation and setting
FR-E700 SC EC/ENE 6 - 247
Communication procedure
Data communication between the computer and inverter is made in the following procedure:
햲
If a data error is detected and a retry must be made, execute retry operation with the user pro-
gram. The inverter comes to an alarm stop if the number of consecutive retries exceeds the
parameter setting.
햳
On receipt of a data error occurrence, the inverter returns "reply data
���
" to the computer again.
The inverter comes to an alarm stop if the number of consecutive data errors reaches or exceeds
the parameter setting.
Communication operation presence/absence and data format types
Data communication between the computer and inverter is made in ASCII code (hexadecimal code).
Data is automatically converted to ASCII format when it is exchanged between an external computer
and the frequency inverter. In the following table the different data formats are referred to with the
letters A–F. The corresponding formats are explained in the next section.
햲
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 6-252.)
햳
The inverter response to the inverter reset request can be selected.
(Refer to page 6-256, Tab. 6-78.)
햴
When any of "0.01 to 9998" is set in Pr. 37 and "01" in instruction code HFF sets data format to A2
or E2. In addition, data format is always A2 and E2 for read or write of Pr. 37.
햵
At mode error and data range error, C1 data contains an error code (refer to page 6-264). Except
for those errors, the error is returned with data format D.
I000030C
Fig. 6-125: Schematic diagram of data exchange
No. Operation
Run
Command
Running
Frequency
Multi
Command
Parameter
Write
Inverter
Reset
Monitor
Parame-
ter Read
���
Communication request is sent to the
inverter in accordance with the user pro-
gram in the computer.
A1
A
A2
햴 A3
A
A2
햴 A B B
���
The inverter will not send data unless
requested.
Present Present Present Present Absent Present Present
���
Reply data from
the inverter
(Data
���
) is
checked for error)
No error
햲
(Request accepted)
C C C1
햵
C C
햳
E
E1
E2
햴
E
E2
햴
With error
(Request rejected)
D D D D D
햳
D D
���
Computer processing delay time
10ms or more
���
Answer from
computer in
response to reply
data
���
(Data
���
) is
checked for error)
No error
햲
(No inverter processing)
Absent Absent
Absent
(C)
Absent Absent
Absent
(C)
Absent
(C)
With error
(Inverter reoutputs
���
)
Absent Absent F Absent Absent F F
Tab. 6-73: Communication and data format
Computer
Data flow
Inverter
Inverter
Data flow
Computer
When data is written
���
햲
���
��� ���
���
햳
When data is read