Memobus/Modbus Drive Operations; Communications Timing - YASKAWA CIPR-GA50C series Technical Manual

6.3 MEMOBUS/Modbus Communications
Note:
1. Set DIP switch S2 to the ON position on the last drive of the MEMOBUS/Modbus communication network to enable the termination
resistor.
2. When you remove the shield from the ground terminal, it can make the communication quality better.
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MEMOBUS/Modbus Drive Operations

Drive parameters will apply to the settings when the drive is running during MEMOBUS/Modbus
communications. This section gives information about the available functions and their related parameters.
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Executable Functions
A PLC can do these operations with MEMOBUS/Modbus communications. Parameter settings (except H5-xx) do
not have an effect on the availability of these operations.
• Monitor the drive status and operate the drive
• Set and view parameters
• Fault Reset Procedure
• Multi-function input settings
The input command from MEMOBUS/Modbus communications and MFDI terminals (S1 to S7) are linked by a
logical OR operation.
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Drive Control
Select the external command that sets the frequency references and motor run/stop with MEMOBUS/Modbus
communications. Use the information in
Table 6.3 Necessary Parameter Settings for Drive Control from MEMOBUS/Modbus
LOCAL Control Selected
External reference 1
External reference 2
For more information about operation mode selection, refer to [Frequency Reference Selection 1] and b1-02 [Run
Command Selection 1]. Refer to H1-xx = 2 [MFDI Function Select = External Reference 1/2 Selection] for more
information about external command.
◆

Communications Timing

To prevent overrun of the slave side, the master cannot send a message to the same drive for a selected length of
time.
To prevent overrun of the master side, the slave cannot send a response message to the master for a selected length
of time.
This section gives information about message timing.
210
Figure 6.4 Wiring Diagram for More than One Drive
Table 6.3 to set the parameters as specified by the application.
No.
b1-01
b1-02
b1-15
b1-16
Name
Frequency Reference Selection 1
Run Command Selection 1
Frequency Reference Selection 2
Run Command Selection 2
YASKAWA SIEPC71061753A GA500 Technical Manual
Setting Value
2 [Memobus/Modbus Communications]
2 [Memobus/Modbus Communications]
2 [Memobus/Modbus Communications]
2 [Memobus/Modbus Communications]