6.11 Specifications of the Industrial Ethernet protocols
6.11.1 Modbus TCP protocol
TCP port
502
Protocol
Internet protocol, version 4 (IPv4)
Network topology
• Tree
• Star
• Line (open daisy chain)
IP configuration
• Fixed IP
• BOOTP (Bootstrap Protocol)
• DHCP (Dynamic Host Configuration Protocol)
Transmission speed
10 and 100 MBit/s
Data transport layer
EtherNet II, IEEE 802.3
Modbus function codes
3, 4, 16, 23
Read/write register
Max. 125 read registers and 123 write registers per telegram
Message mode
Server
Input (Target to Originator)
• All diagnostics and errors informations are with the highest priority
and can be read by a PLC (see the specific protocol manual).
• AI / DI / AO / DO: value, status, unit
• Device and modules: status
• Functons: value, status
Output (Originator to Target)
20 Process Values Network (PVN)
AI = Analogue Input, AO = Analogue Output, DI = Digital Input, DO = Digital Output, Target = Server,
Originator = Client.
37
Technicaldata
Type 8619
English
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