C.5 Drive Operations by MEMOBUS/Modbus
The drive operations that can be performed by MEMOBUS/Modbus communication depend on drive parameter settings.
This section explains the functions that can be used and related parameter settings.
◆ Observing the Drive Operation
A PLC can perform the following actions with MEMOBUS/Modbus communications at any time regardless of
parameter settings (except H5-).
• Observe drive status and drive control terminal status from a PLC.
• Read and write parameters.
• Set and reset faults.
• Set multi-function inputs. Inputs settings from the input terminals S and from MEMOBUS/Modbus communications
are both linked by an OR operation.
◆ Controlling the Drive
To start and stop the drive or set the frequency reference using MEMOBUS/Modbus communications, an external
reference must be selected and the parameters listed in Table C .1 must be adjusted accordingly.
Table C.1 Setting Parameters for Drive Control from MEMOBUS/Modbus
Refer to b1-01: Frequency Reference Selection 1 on page 136 and Refer to b1-02: Run Command Selection 1 on
page 137 for details on external reference parameter selections. Refer to Setting 2: External reference 1/2 selection on
page 216 for instructions on how to select external reference 1 and 2.
Reference Source Parameter Name Required Setting
External Reference 1
b1-01 Frequency Reference Selection 1 2
b1-02 Run Command Selection 1 2
External Reference 2
b1-15 Frequency Reference Selection 2 2
b1-16 Run Command Selection 2 2
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