Message Format - YASKAWA CR700 Technical Manual

Command type
• Operation commands (Run command, stop command)
1 • I/O settings
• Reading the motor and parameter setting values
2 Parameter writing
3 Writing of modified data with the Enter command
*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.
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.

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
description of the command (function) changes.
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.
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Table 5.3 Minimum Wait Time until Message Transmitted
Example
Figure 5.5 Minimum Wait Time Until Transmit
Figure 5.6 Response Wait Time
Figure 5.7 Message Format
5.3 MEMOBUS/Modbus Communications
Figure 5.7. The length of the data changes when the
Minimum Wait Time
*1
5 ms
*1
50 ms
*1
3 to 5 s
305
5