Mitsubishi Electric FR-C500 Instruction Manual page 90

<Computer programming>
(1) Communication protocol
Data communication between the computer and inverter is performed using the
following procedure:
Computer
(Data flow)
Inverter
Inverter
(Data flow)
Computer
REMARKS
*1. If a data error is detected and a retry must be made, execute retry operation with the
user program. The inverter comes to an alarm stop (PUE) 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 inverter in
1)
accordance with the user
program in the computer.
Inverter data processing
2)
time
No error*
Reply data
(Request
from the
accepted)
inverter
3)
(Data 1) is
With error
checked for
(Request
error)
rejected)
Computer processing
4)
delay time
No error*
Answer from
(No inverter
computer in
processing)
response to
5) reply data 3)
With error
(Data 3) is
(Inverter
checked for
outputs 3)
error)
again)
* 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 83.)
Data read
*2
2)
2)
*1
Data write
Run
Running
Comma
Frequency
nd
A
A'
(A") *1
Present Present
C C
D D
Absent Absent
Absent Absent
Absent Absent
81
Computer Link Operation Setting
4) 5)
3)
Paramet Inverter Monitori
er Write Reset
A
A
(A") *2
Present Absent
C Absent
D Absent
Absent Absent
Absent Absent
Absent Absent
Time
Paramet
ng er Read
B B
Present Present
E, E' E
(E") *1 (E") *2
F F
Absent Absent
G G
(Absent) (Absent)
H H
3