Mitsubishi Electric FR-D720-008 Instruction Manual page 204

Communication operation and setting
(3) Message format
Query communication
Programmable controller (master)
Broadcast communication
Programmable controller (master)
Data check time
Various monitors, operation command,
frequency setting (RAM)
Parameter read/write, frequency setting
(EEPROM)
Parameter clear/all clear
Reset command
1) Query
The master sends a message to the slave (= inverter) 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.
REMARKS
The inverter performs the function independently of the inverter station number setting (Pr. 117) during broadcast communication.
200
Query message
Inverter (slave)
Data absence time
(3.5 bytes or more)
Query message
Inverter (slave)
Item Check Time
<20ms
<50ms
<5s
No answer
Inverter response time
(Refer to the following table for the data check time)
Response message
No Response