Mitsubishi Electric FR-E700 Instruction Manual page 401

Parameter
Communication procedure
Data communication between the computer and inverter is made in the following procedure:
Fig. 6-125: Schematic diagram of data exchange
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.
On receipt of a data error occurrence, the inverter returns "reply data
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.
No. Operation
Communication request is sent to the
inverter in accordance with the user pro-
gram in the computer.
The inverter will not send data unless
requested.
Reply data from
No error
the inverter
(Request accepted)
(Data ) is
checked for error)
With error
(Request rejected)
Computer processing delay time
Answer from
No error
computer in
(No inverter processing)
response to reply
With error
data
(Inverter reoutputs
(Data ) is
checked for error)
Tab. 6-73: Communication and data format
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.)
The inverter response to the inverter reset request can be selected.
(Refer to page 6-256, Tab. 6-78.)
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.
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.
FR-E700 SC EC/ENE
Computer
Data flow
Inverter
Inverter
Data flow
Computer
Run
Command
A1
Present
C
D
Absent
)
Absent
Communication operation and setting
When data is read
When data is written
Running Multi Parameter
Frequency Command Write
A
A3
A2 A2
Present Present Present
C C1
D D
10ms or more
Absent
Absent Absent
(C)
Absent F Absent
" to the computer again.
Inverter
Monitor
Reset
A
A B
Absent Present
E
C C E1
E2
D D D
Absent
Absent
(C)
Absent F
I000030C
Parame-
ter Read
B
Present
E
E2
D
Absent
(C)
F
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