Modbus Communication Parameters - Omron MX2 Series User Manual

8-3

Modbus Communication Parameters

Set the following parameters according to the communications specifications.
Note that changes to the C071, C074, and C075 data are applied when the power supply is cycled.
• To control the frequency reference or RUN command via Modbus communication, set the 1st/2nd
Frequency Reference Selection (A001/A201) or 1st/2nd RUN Command Selection (A002/A202) to
03 (Modbus communication).
• According to the communications specifications of the host, set the Communication Speed Selection
(Baud Rate Selection) (C071), Communication Parity Selection (C074), Communication Stop Bit
Selection (C075), Communication Error Timeout Time (C077), and Communication Wait Time
(C078).
• In the Communication Station No. Selection (C072), set the slave address of the inverter.
• If the communications with the host are interrupted for a period longer than the Communication Error
Timeout Time (C077) setting, the inverter will detect an communications error. In the Operation
Selection on Communication Error (C076), set how the inverter should operate if it detects a commu-
nications error.
When this parameter is set to 00 or 01, you must reset the trip in order to resume the inverter control.
?
00 (Trip)
01 (Trip after deceleration stop) : Makes a deceleration stop and detects a Modbus communication
02 (Ignore)
03 (Free-run stop)
04 (Deceleration stop)
Parameter
No.
1st/2nd Frequency
A001/A201
Reference Selection
1st/2nd RUN Command
A002/A202
Selection
Communication Speed
Selection
C071
(Baud Rate Selection)
Communication Station
C072
No. Selection
Communication Parity
C074
Selection
Communication Stop Bit
C075
Selection
Operation Selection on
C076
Communication Error
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
: Detects a Modbus communication error (E41. ) and shuts of the
output.
error (E41. ).
: Ignores the communications error and continues to run according
to the current reference/command.
: Shuts off the output, but does not trip.
: Makes a deceleration stop, but does not trip.
Function name
03:
03:
03:
04:
05:
06:
07:
08:
09:
10:
1. to 247.
00:
01:
02:
1:
2:
00:
01:
02:
03:
04:
8 Communications Functions
Data
Modbus communication
Modbus communication
2400 bps
4800 bps
9600 bps
19.2 kbps
38.4 kbps
57.6 kbps
76.8 kbps
115.2 kbps
No parity
Even parity
Odd parity
1 bit
2 bits
Trip
Trip after deceleration stop
Ignore
Free-run stop
Deceleration stop
Default
Unit
data
−
02
8
−
02
−
05
−
1.
−
00
−
1
−
02
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