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Computer Link Operation Setting
3
INVERTER FUNCTIONS
<Computer programming>
(1) Communication protocol
Data communication between the computer and inverter is performed using the
following procedure:
(2) Communication operation presence/absence and data format types
Communication operation presence/absence and data format types are as follows:
* 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 83.)
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 (PUE) 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.
No. Operation
Run
Comma
nd
Running
Frequency
Paramet
er Write
Inverter
Reset
Monitori
ng
Paramet
er Read
1)
Communication request
is sent to the inverter in
accordance with the user
program in the computer.
A'
A
(A") *1
A
(A") *2
ABB
2)
Inverter data processing
time
Present Present Present Absent Present Present
3)
Reply data
from the
inverter
(Data 1) is
checked for
error)
No error*
(Request
accepted)
C C C Absent
E, E'
(E") *1
E
(E") *2
With error
(Request
rejected)
D D D Absent F F
4)
Computer processing
delay time
Absent Absent Absent Absent Absent Absent
5)
Answer from
computer in
response to
reply data 3)
(Data 3) is
checked for
error)
No error*
(No inverter
processing)
Absent Absent Absent Absent
G
(Absent)
G
(Absent)
With error
(Inverter
outputs 3)
again)
Absent Absent Absent Absent H H
2)
5)4)
3)
2)
*1
*2
(Data flow)
Computer
Inverter
Inverter
(Data flow)
Computer
Time
Data read
Data write