Mitsubishi Electric FR-F500 Series Instruction Manual page 126

<Computer programming>
( 1 ) Communication protocol
Data communication between the computer and inverter is performed using the following procedure:
Computer
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
Reply data from the
inverter
3)
(Data 1) is checked for
error)
4) Computer processing delay time
Answer from computer
in response to reply
5) data 3)
(Data 3) is checked for
error)
* In the communication request data given from the computer to the inverter, 10ms or more is also
required after "no data error (ACK)". (Refer to page 115)
( 3 ) Data format
Hexadecimal data is used. Data is automatically transferred in ASCII between the computer and inverter.
• Data format types
1) Communication request data from computer to inverter
[Data write]
*3
Format A
ENQ
1
*3
Format A'
ENQ
1
[Data read]
*3
Format B
ENQ
1
↓
(Data flow)
1)
Inverter
Inverter
*1
↓ (Data flow)
Run
Command
A'
Present
No error*
C
(Request accepted)
With error
D
(request rejected)
Absent
No error*
(No inverter Absent
processing)
With error
(Inverter outputs 3) Absent
again.)
Inverter *5
Instruction
station Waiting
code
number time
2 3 4 5 6
Inverter *5
Instruction
station Waiting
code
number time
2 3 4 5 6
Inverter *5
Instruction
station Waiting
code
number time
2 3 4 5 6
Data read
*2
4) 5)
2) 3)
Data write
Running Parameter
Frequency Write
A A
Present Present
C C
D D
Absent Absent
Absent Absent
Absent Absent
Sum
Data
check
7 8 9 10 11 12
Sum
Data *4
check
←Number of characters
7 8 9 10 11
Sum
*4
check
←Number of characters
7 8 9
113
PARAMETERS
Time
Para-
Inverter Monitor-
meter
Reset ing
Read
A B B
Absent Present Present
E
Absent E
E'
Absent F F
Absent Absent Absent
Absent G G
Absent H H
*4
←Number of characters
13
4