Vacon optea Installation Manual page 74

vacon • 74
Modbus TCP Communication
PLC
Modbus Query (1)
Modbus Response (1), TCP, ACK
Modbus Query (2)
Packet lost, no response
TCP retransmission, Modbus Query (2)
Packet lost, no response
TCP retransmission, Modbus Query (2)
Modbus Response (2), TCP, ACK
Normal communication continues
7
Drive
TCP, ACK
Figure 35. Modbus TCP and UDP communication errors comparison
Modbus UDP Communication
PLC
Modbus Response (1)
Modbus Response (4)
Normal communication continues
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Modbus TCP / Modbus UDP
Drive
Modbus Query (1)
Modbus Query (2)
Packet lost, no response
Modbus Query (3)
Packet lost, no response
Modbus Query (4)
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