Mitsubishi Electric FR-S500E Instruction Manual page 142

Communication parameters
<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
(Request
from the
accepted)
inverter.(Da
3)
ta 1) is
With error
checked for
(request
error)
rejected)
4) Computer processing
delay time
Answer No error*
from (No inverter
computer in processing)
response to
5)
With error.
reply data
(Inverter
3). (Data 3)
outputs 3)
is checked
again.)
for error)
* 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 135.)
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
132
*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