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PARAMETERS
101
<Computer programming>
(1) Communication protocol
Data communication between the computer and inverter is performed using the
following procedure:
Data read
Data write
1) 5)4)
3)
2)
*
1
*
2
↓
(Data flow)
Inverter
Inverter
Time
Computer
Computer
↓
(Data flow)
*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
Command
Running
Frequency
Parameter
Write
Inverter
Reset
Monitor-
ing
Parame-
ter Read
1)
Communication request is
sent to the inverter in
accordance with the user
program in the computer.
A
′
A
(A")
Note 1
A
(A")
Note 2
ABB
2)
Inverter data processin
g
time
Present Present Present Absent Present Present
No error*
(
Request
accepted)
C C C Absent
E,E
′
(E
"
)
Note 1
E
(E
"
)
Note 2
3)
Reply data
from the
inverter
(Data 1) is
checked for
error.
With error
(
request
rejected)
D D D Absent F F
4)
Computer processin
g
dela
y
time
Absent Absent Absent Absent Absent Absent
No error*
(
No inverter
processin
g)
Absent Absent Absent Absent G G
5)
Answer from
computer in
res
p
onse to re
p
l
y
data 3). (Data 3)
is checked for
error)
With error
(Inverter
outputs 3)
again)
Absent Absent Absent Absent H H
* 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 104.)
Note 1. When any of "0.01 to 9998" is set in Pr. 37 "speed display" and "1" in data
code "HFF", the data format is always A" or E" regardless of the data code
"HFF" setting. The output frequency is the value of the speed display and its
unit is 0.001r/min. If the data code FF is not 1, the unit is 1r/min and the 4-digit
data format can be used.
2. The read/write data format of Pr. 37 "speed display" is always E"/A".