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130
Communication functions (Pr. 117 to Pr. 124, Pr. 342)
<Computer programming>
(1) Communication procedure
Data communication between the computer and inverter is made in the following procedure.
*1 If a retry must be made at occurrence of a data error, 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 retry 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.
* 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 132.)
(3) Data format
Data are used in hexadecimal.
Data are automatically converted into ASCII for communication between the computer and inverter.
Data format types
1) Communication request data from the computer to the inverter
No. Operation
Run
Command
Running
Speed
Parameter
Write
Inverter
Reset
Monitoring
Parameter
Read
1)
Communication request is sent to the
inverter in accordance with the user program
of the computer.
A'
A
A"
AABB
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"
E
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*
Inverter performs
no processing
Absent Absent Absent Absent G G
With error
Inverter re-outputs
3
Absent Absent Absent Absent H H
When data are read
When data are written
1) 5)4)
3)2)
*1
*2
Computer
(Data flow)
Inverter
Computer
Inverter
Time
(Data flow)
*1
Format A
ENQ
*2
Inverter
station
number
Instruction
code
Data
Sum
check
1 2 3 4 5 6 7 8 9 10 11 12 13
Number of characters
Format A'
ENQ
Instruction
code
Data
Sum
check
1234567891011
Format B
ENQ
Instruction
code
Sum
check
123456789
[Data write]
[Data read]
*1
Number of characters
Number of characters
*4
*4
Waiting
time
*3
Waiting
time
*3
Waiting
time
*1
*3
*4
*1
Format A''
ENQ
Instruction
code
Data
Sum
check
1 2 3 4 5 6 7 8 9 10 11 12 13
Number of character
s
*4
Waiting
time
*3
14 15
*2
Inverter
station
number
*2
Inverter
station
number
*2
Inverter
station
number