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Communication operation and setting
(3) Message format
Data check time
1)Query
The master sends a message to the slave (= drive unit) at the specified address.
2)Normal Response
After receiving the query from the master, the slave executes the requested function and returns the corresponding normal
response to the master.
3)Error Response
If an invalid function code, address or data is received, the slave returns it to the master.
When a response description is returned, the error code indicating that the request from the master cannot be executed is
added.
No response is returned for the hardware-detected error, frame error and CRC check error.
4)Broadcast
By specifying address 0, the master can send a message to all slaves. All slaves that received the message from the
master execute the requested function. In this communication, the slaves do not return a response to the master.
Item Check Time
Various monitors, operation command, speed setting (RAM) < 20ms
Parameter read/write, speed setting (EEPROM) < 50ms
Parameter clear/all clear < 5s
Reset command No answer
REMARKS
The drive unit performs the function independently of the drive unit station number setting (Pr.117) during broadcast
communication.
Query communication
Broadcast communication
Query message
Query message
Response message
Drive unit response time
(Refer to the following table for the data check time)
Data absence time
(3.5 bytes or more)
Drive unit (slave)
Drive unit (slave)
Programmable controller
(master)
Programmable controller
(master)
No Response