8-3
Modbus Communication Parameters
Set the following parameters according to the communications specifications.
• To control the frequency reference or RUN command via Modbus communication, set the 1st Fre-
quency Reference Selection (F01) or 2nd Frequency Reference Selection (C30) to “14: RS-485
communication,” and the 1st RUN Command Selection (F02) or 2nd RUN Command Selection
(E102) to “4: RS-485 communication”.
• According to the communications specifications of the host, set the RS-485 Communication Baud
Rate (y14), RS-485 Communication Parity Bit Selection (y16), RS-485 Communication Timeout
Time (y18), and RS-485 Communication Response Interval Time (y19).
• In the RS-485 Communication Station No. Selection (y11), set the slave address of the inverter.
• If the communications with the host are interrupted for a period longer than the RS-485 Communica-
tion Timeout Time (y18), the inverter will detect an communications error. In the Operation Selection
on Communication Error (y12), set how the inverter should operate if it detects a communications
error.
When this parameter is set to 0, 1, 2, or 11 and tripped, you must reset the trip in order to resume
the inverter control.
y12 Action at communications error
0: Immediately trip Detects a Modbus communication error (ErP) and shuts off the output.
1: Trip after running for the period
specified by timer
At communications error, this operates the inverter for the period speci-
fied by timer (y13), then displays a Modbus communication error (ErP)
and stops operation.
2: Retry communications for the pe-
riod specified by timer
, and trip if
communications are not restored.
Continue running if communica-
tions are restored.
At communications error, retries communications for the period specified
by timer (y13), and continues operation if communications are restored. If
communications are not restored, this displays a Modbus communication
error (ErP) and stops operation.
3: Continue to run Ignores the communications error, and continues to run according to the
current reference/command.
11: Trip after deceleration stop Makes a deceleration stop and detects a Modbus communication error
(ErP).
13: Free-run stop Shuts off the output, but does not trip.
14: Deceleration stop Makes a deceleration stop, but does not trip.
Parameter No. Function name Data
Default
data
Unit
F01/C30
1st Frequency Refer-
ence Selection/2nd Fre-
quency Reference Se-
lection
14: RS-485 communication 0 -
F02/E102
1st RUN Command Se-
lection/2nd RUN Com-
mand Selection
4: RS-485 communication 2 -
8 Communications Functions
8-5
M1 Series Standard Type User's Manual (I669)
8-3 Modbus Communication Parameters
8
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