Mitsubishi Electric FR-D720S SC EC, Инструкция по эксплуатации

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Communication operation and settings Parameter
6 - 206
Communication procedure
Data communication between the computer and inverter is made in the following procedure:
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.
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 ex-
ternal 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.
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 6-211.)
The inverter response to the inverter reset request can be selected. (Refer to page 6-215,
Tab. 6-57.)
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 6-223)
Except for those errors, the error is returned with data format D.
I000030C
Fig. 6-109: Schematic diagram of data exchange
No
.
Operation
Run
Command
Running
Frequency
Multi
Command
Parame-
ter Write
Inverter
Reset
Monitor
Parame-
ter Read
Communication request is sent to the inverter in
accordance with the user program in the computer.
A1
A
A2
A3
A
A2
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
(Request accepted)
C C C1 C C
E
E1
E2
E3
E
E2
With error
(Request rejected)
D D D D D D D
Computer processing delay time
10ms or more
Answer from
computer in response
to reply data
(Data
) is checked for error)
No error
(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. 6-52: Communication and data format
Computer
⇓
Data flow
Inverter
Inverter
⇓
Data flow
Computer
When data is written
When data is read