459
PARAMETER
2
P
ARAM
ETE
R
2.21.6 Modbus-RTU communication [Pr.117*, 118*, 120*, 122*, 331*, 332*, 334*, 343,
502*, 539*, 549]
(common)
Communication operation and parameter setting can be
performed using the Modbus-RTU communication protocol
from the RS-485 terminal in
or the PU
connector in
.
Set [
Pr. 549 Protocol selection = 1
] to use Modbus RTU
protocol.
If a communication option is installed while [
Pr. 550 NET
mode operation command source selection
=9999] (initial
value) in
, command source (for example,
run command) at RS-485 terminal becomes invalid.
Change the setting to [
Pr. 550
= 1] in that case. (
Refer to
page 436
When NET mode command source is at the PU connector
in
(
[
Pr. 551 PU mode operation command source
selection
≠
2
]), operation by Modbus RTU communication is
available.
When NET mode command source is at the PU connector
in
([
Pr. 550 NET mode operation command source
selection = 2 or 9999 (initial value)
], no communication
option), operation by Modbus RTU communication is
available. (
Refer to page 436
)
*1
When Modbus-RTU communication is performed from the master with address 0 (station 0) set, broadcast communication is
selected and the inverter does not send a response message to the master. When response from the inverter is necessary, set
[
Pr. 117, 331 RS-485 communication station
0
] (initial value is 0). Some functions are invalid for broadcast communication.
*2
Not used in Modbus RTU communication.
common
(*[
Pr. 117, 118, 120, 122, 502
] are not used in
.)
(*[
Pr. 331, 332, 334, 539
] are not available for
.)
A700
F700
E700
D700
A700
F700
E700
D700
A700
F700
D700
E700
[Pr.]
Name
Initial Value
Setting
Range
Description
Available
Inverters
117
RS-485
communication station
number
0
0
No reply to the master
*1
*2
331
1 to 247
Specifies the inverter station number.
Set the inverter station numbers when two or more
inverters are connected to one personal computer.
—
118
RS-485
communication speed
96
3, 6, 12, 24,
48, 96, 192,
384
Set the communication speed.
The setting value 100 equals the communication
speed.
For example, the communication speed is 9600bps
when the setting value is 96.
*2
332
—
120
RS-485
communication parity
check selection
2
0
Without parity check
Stop bit length 2bit
*2
1
With odd parity check
Stop bit length 1bit
334
2
With even parity check
Stop bit length 1bit
—
343
Communication error
0
—
Displays the number of communication errors during
Modbus-RTU communication.
122
Modbus-RTU
communication check
time interval
9999
0
0
Modbus-RTU communication can be made, but the
inverter will come to trip in the NET operation mode.
*2
539
0 to 999.8s Set the interval of communication check time.
9999
No communication check
—
502
Stop mode selection
at communication
error
0
At Fault
Occurrence
Indication
Fault
Output
At Fault
Removal
*2
0, 3
0
Coasts to
stop
E.PUE
Output
Stop
(E.PUE)
1
Decelerates
to stop
After stop
E.PUE
Output after
stop
Stop
(E.PUE)
2
Decelerates
to stop
After stop
E.PUE
Without
output
Automatic
restart
functions
549
Protocol selection
0
0
Mitsubishi inverter (computer link operation) protocol
1
Modbus-RTU protocol
A700
F700
E700
D700
A700
F700
E700
D700
E700
D700
Summary of Contents for FR-A700 Series
Page 245: ...279 2 PARAMETER PARAMETER MEMO ...
Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...
