Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 840 / 1218

(N) Operation via communication and its settings Parameters
5 - 638
If a data error is detected and a retry must be made, perform retry operation with the user program.
The inverter trips if the number of consecutive retries exceeds the parameter setting.
On receipt of a data error occurrence, the inverter returns reply data ( ) to the computer again.
The inverter trips if the number of consecutive data errors reaches or exceeds the parameter
setting.
Communication operation presence/absence and data format types
●
Data communication between the computer and inverter is made in ASCII code (hexadecimal
code).
●
Communication operation presence/absence and data format types are as follows.
In the communication request data from the computer to the inverter, 10 ms or more is also
required after "no data error (ACK)". (Refer to page 5-643.)
Reply from the inverter to the inverter reset request can be selected. (Refer to page 5-648.)
At mode error, and data range error, C1 data contains an error code. (Refer to page 5-654.)
Except for those errors, the error is returned with data format D.
Sy
m
b
o
l
Operation
Ope
ra
ti
on
co
mma
nd
Ope
ra
ti
on
freq
ue
nc
y
Mu
lti
co
mma
nd
Pa
ra
m
e
te
r
writ
e
In
v
e
rt
er
res
e
t
Monit
o
r
Pa
ra
m
e
te
r
read
Communication request is sent to the
inverter in accordance with the user
program in the computer.
A, A1 A A2 A A B B
Inverter data processing time With With With With Without With With
Reply data from
the inverter (Data
(
) is checked for
an error)
No error
(Request accepted)
C C
C1
C
C
E, E1, E2,
E3
E
With error
(Request rejected)
D D D D
D
D D
Computer processing delay time 10 ms or more
Answer from
computer in
response to reply
data
(Data is checked
for error)
No error
(No inverter
processing)
Without Without
Without
(C)
Without Without
Without
(C)
Without
(C)
With error
(Inverter outputs
again.)
Without Without F Without Without F F
Tab. 5-276: Communication and data format