Mitsubishi FR - S500 Instruction Manual page 129

<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 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
from the (Request
accepted)
inverter.
3)
(Data 1) is
With error
checked for
(request
error)
rejected)
Computer processing
4)
delay time
Answer from No error*
(No inverter
computer in
response to processing)
5) reply data
With error.
3). (Data 3)
(Inverter
is checked
outputs 3)
for 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 123.)
Data read
1)
*1
Data write
Run Running
Command Frequency
A' A (A")*1
Present Present
C C
D D
Absent Absent
Absent Absent
Absent Absent
120
*2
4) 5)
2)
3)
Parameter Inverter
Write Reset
A (A")*2 A
Present Absent
C Absent
D Absent
Absent Absent
Absent Absent
Absent Absent
Time
Monitor- Parame-
ing ter Read
B B
Present Present
E, E' E
(E")*1 (E")*2
F F
Absent Absent
G G
(Absent) (Absent)
H H