Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual page 129

<Computer programming>
( 1 ) Communication protocol
Data communication between the computer and inverter is performed using the following procedure:
Computer
↓
Inverter
Inverter
↓
Computer
*1. If a data error is detected and a retry must be made, execute retry operation from 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
Communication request is sent to the
1) inverter in accordance with the user
program.
2) Inverter data processing time
No error
Reply data from the
Request accepted
inverter
3)
(Data 1 is checked for
With error
error)
request rejected
4) Computer processing delay time
No error
Answer from
No processing
computer in response
5) to reply data 3
(Data 3 is checked for With error data
error) 3 is output
( 3 ) Data format
Hexadecimal data is used. Data is automatically transferred in ASCII between the computer and inverter.
1) Data format types
(1) Communication request data from computer to inverter
[Data format]
*3
Format A
ENQ
1
*3
Format A'
ENQ
1
[Data read]
*3
Format B
ENQ
1
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Data read
(Data flow)
*
2
1)
2) 3)
*
1
(Data flow)
Data write
Run Running
Command Frequency
A' A
Present Present
C C
D D
Absent Absent
Absent Absent
Absent Absent
Inverter *5
Instruction
station Waiting Data
code
time
number
2 3 4 5 6 7 8 9 10
Inverter *5
Sum
Instruction
station Waiting
Data
sheck
code
number time
2 3 4 5 6 7 8 9 10
Inverter *5
Instruction Sum
station
Waiting *4
code sheck
number
time
←Number of characters
2 3 4 5 6 7 8 9
116
PARAMETERS
4)
5)
Time
Parameter
Inverter Reset Monitoring
Write
A A B
Present Absent Present
E
C Absent
E'
D Absent F
Absent Absent G
Absent Absent G
Absent Absent H
Sum
*4
sheck
←Number of characters
11 12 13
*4
←Number of characters
11
Parameter
Read
B
Present
E
F
G
G
H