Mitsubishi Electric FR-A700 Technical Manual page 425

2.21.6 Modbus-RTU communication [Pr.117*, 118*, 120*, 122*, 331*, 332*, 334*, 343,
502*, 539*, 549]
Communication operation and parameter setting can be
performed using the Modbus-RTU communication protocol
from the RS-485 terminal in
connector in
E700 D700
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,
A700 F700
run command) at RS-485 terminal becomes invalid.
[Pr.] Name
117
RS-485
communication station
number
331
118
RS-485
communication speed
332
120
RS-485
communication parity
check selection
334
Communication error
343
122
Modbus-RTU
communication check
time interval
539
Stop mode selection
502 at communication
error
549 Protocol selection
*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
*2 Not used in Modbus RTU communication.
common
(common)
(*[Pr. 117, 118, 120, 122, 502] are not used in
(*[Pr. 331, 332, 334, 539] are not available for
or the PU
A700 F700
.
Setting
Initial Value
Range
0
0
1 to 247
3, 6, 12, 24,
96 48, 96, 192,
384
0
1
2
2
0 —
A700 F700 0
9999
0 to 999.8s Set the interval of communication check time.
E700 D700
9999
0
0, 3
E700
0
D700
0
1
2
0
0
1
0] (initial value is 0). Some functions are invalid for broadcast communication.
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
D700
≠
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
E700
selection = 2 or 9999 (initial value)], no communication
option), operation by Modbus RTU communication is
available. (Refer to page 436)
Description
No reply to the master
*1
Specifies the inverter station number.
Set the inverter station numbers when two or more
inverters are connected to one personal computer.
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.
Without parity check
Stop bit length 2bit
With odd parity check
Stop bit length 1bit
With even parity check
Stop bit length 1bit
Displays the number of communication errors during
Modbus-RTU communication.
Modbus-RTU communication can be made, but the
inverter will come to trip in the NET operation mode.
No communication check
At Fault Fault
Indication
Occurrence Output
Coasts to
E.PUE Output
stop
Decelerates After stop Output after
to stop E.PUE stop
Decelerates After stop Without
to stop E.PUE output
Mitsubishi inverter (computer link operation) protocol
Modbus-RTU protocol
459
PARAMETER
.)
A700 F700
.)
E700 D700
Available
Inverters
A700 E700
F700 D700
*2
—
*2
—
*2
—
*2
—
At Fault
Removal
Stop
(E.PUE)
*2
Stop
(E.PUE)
Automatic
restart
functions
2