
5.3 MEMOBUS/Modbus Communications
304
YASKAWA
SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Figure 5.4 Wiring Diagram for More than One Drive
Note:
Set DIP switch S2 to the ON position on the last drive of the MEMOBUS/Modbus communication network to enable the termination
resistor.
◆
Drive Operations by MEMOBUS/Modbus
The drive parameters apply to the settings even if the drive is run during MEMOBUS/Modbus communications.
This section describes the types of usable functions and their related parameters.
■
Executable Function
A PLC can perform the following operations with MEMOBUS/Modbus communications at any time regardless of
parameter settings (except for
H5-xx
).
•
Observe the drive status and operate the drive from a PLC
•
Set and view parameters
•
Fault Reset Procedure
•
Multi-function input setting (The input command from MEMOBUS/Modbus communications and MFDI
terminals (S1 to S10) are linked by a logical OR operation.)
■
Drive Control
Select the external command for setting the frequency references and the motor run/stop using MEMOBUS/
Modbus communications, and set the parameters according to the application using the following table.
Table 5.2 Required Parameter Setting for Drive Control from MEMOBUS/Modbus
LOCAL Control Selected
No.
Name
Setting Value
External reference 1
b1-01
Frequency Reference Selection 1
2 [Memobus/Modbus Communications]
b1-02
Run Command Selection 1
2 [Memobus/Modbus Communications]
External reference 2
b1-15
Frequency Reference Selection 2
2 [Memobus/Modbus Communications]
b1-16
Run Command Selection 2
2 [Memobus/Modbus Communications]
For more information about operation mode selection, refer to
b1-01 [Frequency Reference Selection 1]
and
b1-02
[Run Command Selection 1]
. Refer to
H1-xx = 2 [MFDI Function Selection = 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 certain amount of
time. Similarly, to prevent overrun of the master side, the slave cannot send a response message to the master for a
certain amount of time. This section explains the message send/receive timing.
■
Command Message from Master to Slave
To prevent data loss and overrun, after the master receives a message from the slave, the master cannot send the
same type of command message to the same slave for a certain amount of time. The minimum wait time differs
depending on the type of message. Check by referencing the following table.
Summary of Contents for CR700
Page 1: ......
Page 244: ...3 13 Test Run Checklist 244 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 422: ...7 7 Storage Guidelines 422 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 426: ...8 2 Disposal Instructions 426 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 837: ...EZZ023535 2 35 1 Revision History Revision Revised Content Date First Edition 2017 08 ...
Page 872: ...EZZ023536 2 16 Revision History Revision Revised Content Date First Edition 2017 08 ...