Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 128

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