Mitsubishi Electric FR-A820-00046 Instruction Manual page 975

Parameters
● Using UDP/IP
The following is the communication procedure when executing SLMP communication with UDP/
IP. With UDP/IP, connections are not established when communication is executed, and whether
data is received normally or not is not checked. Therefore, the line load is low. However, data is
less reliable as compared to TCP/IP.
The process is repeated as needed.
Fig. 5-385:
FR-A800
External device
Sending a request message
The external device sends a request message to
the inverter.
Receiving the response message
The external device receives the response
message from the inverter and confirms the
operation result.
End of the communication
The external device executes the closing
operation to close the communication.
Communication procedure when executing SLMP communication with UDP/IP
Ethernet communication (FR-A800-E)
Inverter
Execution of the operation
According to the request message sent from the
external device, the inverter executes a reading,
writing, or other operation.
Returning a response message
Upon completion of the operation, the inverter
sends a response message to the external
device.
I003117E
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