5.3 MEMOBUS/Modbus Communications
YASKAWA
SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
305
Table 5.3 Minimum Wait Time until Message Transmitted
Command type
Example
Minimum Wait Time
1
•
Operation commands (Run command, stop command)
•
I/O settings
•
Reading the motor and parameter setting values
5 ms
2
Parameter writing
50 ms
3
Writing of modified data with the Enter command
3 to 5 s
*1
If the drive receives a message within the minimum wait time, it executes command type 1 and sends a response message. If the
drive receives command type 2 and command type 3 messages within the minimum wait time, a communications error is generated
or the drive disregards the command it received.
Figure 5.5 Minimum Wait Time Until Transmit
The timer within the master must be set to check how long it takes for the slave to respond to the master. If the
timer is set and a response message is not returned back from the slave within a certain amount of time, the master
retransmits the message.
■
Response Message from Slave
When the slave receives the command message from the master, it processes the data that was sent. When the wait
time set in
H5-06 [Drive Transmit Wait Time]
passes, it sends a response message to the master. Increase the wait
time set in
H5-06
when overrun occurs on the master.
Figure 5.6 Response Wait Time
◆
Message Format
■
Communication Message Description
In MEMOBUS/Modbus communications, the master sends commands to the slave, then the slave responds. The
master and slave send their messages in the configuration in
. The length of the data changes when the
description of the command (function) changes.
Figure 5.7 Message Format
■
Slave Address
Set the slave address of the drive to 00 to FF (Hex.). When the slave address is 00 (Hex), the master sends the
command and all slaves receive the command.
The slave will not send a response message to the master.
Содержание CR700
Страница 1: ......
Страница 2: ...This Page Intentionally Blank 2 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 244: ...3 13 Test Run Checklist 244 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 422: ...7 7 Storage Guidelines 422 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 426: ...8 2 Disposal Instructions 426 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Страница 837: ...EZZ023535 2 35 1 Revision History Revision Revised Content Date First Edition 2017 08 ...
Страница 872: ...EZZ023536 2 16 Revision History Revision Revised Content Date First Edition 2017 08 ...