Instruction manual

PARAMETERS
117
<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
Time
↓
(Data flow)
Inverter
Inverter
Computer
Computer
↓
(Data flow)
*
2
*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 processing 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 processing delay time Absent Absent Absent Absent Absent Absent
No error*
(No inverter
processing)
Absent Absent Absent Absent G G
5)
Answer from
computer in
response to reply
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 120.)
Note 1. When any of "0.01 to 9998" is set in Pr. 37 "speed display" and "1" in data
code "FF
H
", the data format is always A" or E" regardless of the data code
"FF
H
" 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".