Mitsubishi Electric FR-F820-00046, Инструкция по эксплуатации

Страница: 662 / 940

(N) Operation via communication and its settings Parameters
5 - 490
Message format
●
Data check time
●
Query
A message is sent to the slave (for instance, the inverter) having the address specified by the
master.
●
Normal Response
After the query from the master is received, the slave executes the request function, and returns
the corresponding normal response to the master.
●
Error Response
When an invalid function code, address or data is received by the slave, the error response is
returned to the master.
This response is appended with an error code that indicates the reason why the request from the
master could not be executed.
This response cannot be returned for errors, detected by the hardware, frame error and CRC check
error.
●
Broadcast
The master can broadcast messages to all slaves by specifying address 0. All slaves that receive a
message from the master execute the requested function. With this type of communication, slaves
do not return a response to the master.
I001227E
Fig. 5-242: Message format
Item Check time
Various monitors, operation command, Frequency setting (RAM) < 12 ms
Parameter read/write, Frequency setting (EEPROM) < 30 ms
Parameter clear / all clear < 5 s
Reset command No answer
Tab. 5-241: Data check time
NOTE During broadcast communication, functions are executed regarded of the set inverter station
number (Pr. 331).
Query communication
Query message
Response message
Programmable controller
(Master)
Inverter (slave)
Data absence time
(3.5 bytes or more)
Inverter response time
(Refer to the following table for the data
check time)
Broadcast communication
Query message
No response Inverter (slave)
Programmable controller
(Master)