Method of control via Modbus protocol
−34−
4.14 Timing charts
Communication start
Query
Response
Master
Slave
Power supply input
Communication
ON
OFF
1 s or more
∗
*
Tb2 (transmission waiting time) + C3.5 (silent interval) + command processing time
Operation start
Query
∗
1
Response
Master
Slave
MOVE output
Communication
ON
OFF
∗
2
∗
3
*1
A message including a query to start operation via RS-485 communication.
*2
Tb2 (transmission waiting time) + C3.5 (silent interval) + command processing time
*3
C3.5 (silent interval) + command processing time
Operation stop, speed change
Query
∗1
Response
Master
Slave
Motor speed command
Communication
∗4
∗2
∗3
*1
A message including a query to stop operation and another to change the speed via RS-485 communication.
*2
Tb2 (transmission waiting time) + C3.5 (silent interval) + command processing time
*3
C3.5 (silent interval) + command processing time
*4
The specific time varies depending on the driver input command or the parameter setting.
Configuration
Response
Master
Slave
Internal processing
Communication
∗2
∗3
Query
∗1
Query
Internal processing
was in progress.
*1
A message including a query for configuration via RS-485 communication.
*2
Tb2 (transmission waiting time) + C3.5 (silent interval) + command processing time
*3
C3.5 (silent interval) + 1 s or less
*4
Execute a query after the driver internal processing is completed.