YASKAWA HV600 Technical Reference page 733

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.
■
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 selected length of time. The minimum wait time is different for
each type of message. Refer to
Command Type
• Operation commands (Run command, stop command)
1 • I/O settings
• Reading the motor and parameter setting values
2 Writing a parameter
3 Writing of modified data with the Enter command
4 Enter with storage to drive EEPROM after initialization
*1 When the drive receives a message in the minimum wait time, it does command type 1 and sends a response message. If the drive
receives command type 2 or command type 3 messages in the minimum wait time, it will trigger a communications error or the drive will
ignore the command.
You must set the timer in the master to measure the length of time for the slave to respond to the master. If you set the
timer, but the slave does not send a response message in a specified length of time, the master will send the message
again.
■
Response Message from Slave
The slave receives the command message from the master then processes the data it received. The slave then waits for
the time set in H5-06 [Drive Transmit Wait Time] then sends a response message to the master. If overrun occurs on
the master, increase the wait time set in H5-06.
◆
Metasys N2 Point Database
This section describes the Metasys N2 point database. This database features 100 logical points: 38 Analog Inputs
(AI), 32 Analog Outputs (AO), 19 Binary Inputs (BI) and 11 Binary Outputs (BO). These points configure, control,
and monitor the operation of the drive.
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Table 10.14 to find the minimum wait times.
Table 10.14 Minimum Wait Time to Send a Message
Example
Figure 10.14 Minimum Wait Time to Send a Message
Figure 10.15 Response Wait Time
10.5 Metasys N2 Communications
Minimum Wait Time
*1
5 ms
H5-11 = 0: 50 ms
H5-11 = 1: 200 ms
200 ms to 2 s, depending on the number of
parameters that were changed
5 s
*1
*1
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