Modbus-Rtu Communication (Pr. 331, Pr. 332, Pr. 334, Pr. 343, Pr. 502, Pr. 539, Pr. 549, Pr. 779) - Mitsubishi Electric FR-F740 EC Instruction Manual

Parameter
6.18.7 Modbus-RTU communication
(Pr. 331, Pr. 332, Pr. 334, Pr. 343, Pr. 502, Pr. 539, Pr. 549, Pr. 779)
Using the Modbus-RTU communication protocol, communication operation or parameter set-
ting can be performed from the RS485 terminals of the inverter.
Pr.
Name
No.
RS485 communica-
331
tion station number
RS485 communica-
332
tion speed
RS485 communica-
334
tion parity check
selection
Communication
343
error count
Stop mode selection
502
at communication
error
Modbus-RTU com-
539
munication check
time interval
549
Protocol selection
Operation frequency
779
during communica-
tion error
The above parameters can be set when Pr. 160 = 0.
The inverter works with the initial parameter setting if a value other than the setting range
is set.
FR-F700 EC
Initial Setting
Description
Value Range
0 Broadcast communication is selected
Specify the inverter station number.
0
Set the inverter station numbers when two or
1–247
more inverters are connected to one personal
computer
Set the communication speed.
The setting value × 100 equals the communication
3/6/12/24/48/
96 speed.
96/192/384
For example, the communication speed is 9600bps
when the setting value is "96".
Without parity check
0
Stop bit length: 2bits
With odd parity check
2 1
Stop bit length: 1bit
With even parity check
2
Stop bit length: 1bit
Display the number of communication errors dur-
0 —
ing Modbus-RTU communication. Reading only
At fault
occur-
rence
Coasts to
0
stop
Deceler-
1 ates to
0
stop
Deceler-
2 ates to
stop
Continues
3 running at
Pr. 779
Modbus-RTU communication can be made, but
0 the inverter will come to trip in the NET operation
mode.
9999
Set the interval of communication check time.
0.1–999.8s
(same specifications as Pr. 122)
9999 No communication check (signal loss detection)
0 Mitsubishi inverter (computer link) protocol
1 Modbus-RTU protocol
0
2 BACnet MS/TP protocol
Motor runs at the specified frequency at a commu-
0– 400Hz
nication error.
9999
Motor runs at the frequency used before the com-
9999
munication error.
Communication operation and setting
Fault At fault
Indication
output removal
Stop
E.SER Output
(E.SER)
After stop Output Stop
E.SER after stop (E.SER)
Automatic
After stop Without
restart
E.SER output
functions
Without Operates
—
output normally
Refer to
Parameters referred to
Section
—
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