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

Transistorized inverter, high function & low acoustic noise.
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<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

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