232 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
C.6 Communications Timing
C.6 Communications Timing
The master should wait a certain time between sending and receiving data.
◆ Command Messages from Master to Drive
In order to prevent data loss, the master must wait between receiving a response and sending the same type of command
as before to the same slave drive. The minimum wait time depends on the command as shown in Table C.3.
Table C.3 Minimum Wait Time for Sending Messages
Figure C.5
Figure C.5 Minimum Wait Time for Sending Messages
A timer should be set in the master to check how long it takes for the slave drive (s) to respond to the master. If no
response is received within a certain amount of time, the master should try resending the message.
◆ Response Messages from Drive to Master
If the drive receives a command from the master, it will process the data received and wait for the time set in H5-06 until
it responds. Increase H5-06 if the drive response causes data loss in the master.
Figure C.6
Figure C.6 Minimum Response Wait Time
Command Type
<1> If the drive receives command type 1 data during the minimum wait time, it will perform the command and then respond. However, if it
receives a command type 2 or 3 during that time, either a communication error will result or the command will be ignored.
Example Minimum Wait Time
1
• Control command (Run, Stop)
• Set inputs/outputs
• Read monitors and parameter values
5 ms <1>
2 • Write parameters
H5-11 = 0: 50 ms
H5-11 = 1: 200 ms
<1>
3 • Save changes using an Enter command
200 ms to 2 s, depending on the number
of parameters that were changed
<1>
4 • Enter with storage to drive EEPROM after initialization 5 s
Command message Response message Command message
Master→Drive Master→DriveDrive→Master
24 bit length
Master Send
Wait Time
Time
Time
Command message Response message Command message
Master→Drive Master→DriveDrive→Master
24 bit length
H5-06
setting
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