Mitsubishi Electric 800 Series Instruction Manual page 89

• Using UDP
The following is the communication procedure when executing SLMP communication with UDP.
With UDP, 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.
Sending a request message
The external device sends a request message
to the inverter.
The process is repeated as needed.
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.
 Message format
• Request message format
The following is the format of a request message sent from the external device to the inverter. The request message data
length is 2047 bytes at the maximum.
Header Subheader
88
2. Ethernet Communication
2.10 SLMP
External device
Destination Destination Destination unit
network station I/O No.
No. No.
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.
Destination Request data Monitoring timer Request data
multidrop
length
station No.
Inverter
Execution of the operation
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