System overview Modbus

System overview

Modbus

Modbus RTU

Modbus RTU is an open, serial communications protocol based on the master/slave architecture. Since it is extremely easy to implement on all kinds of serial interfaces, it has gained wide acceptance.

 

Modbus TCP

Due to its open standards Modbus TCP is common for the use of Ethernet in the fields of automation. Modbus TCP has a so called “Well known port (Port 502)”, which makes it routable via the Internet.

 
Ordering information  
Automation
TwinCAT 3
TF6250 TC3 Modbus TCP
TF6255 TC3 Modbus RTU
TwinCAT 2
TS6250 license for using the TwinCAT Modbus TCP Server for communication with Modbus TCP end devices
TS6255 IEC 61131-3 software library for TwinCAT PLC with Modbus RTU function blocks for serial communication with Modbus end devices
IPC
Embedded PC
CX8090 Ethernet Embedded PC
I/O
Bus Coupler
BK7300 Modbus Bus Coupler for up to 64 Bus Terminals
BK7350 Modbus “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
Bus Terminal Controller
BC7300 Modbus Bus Terminal Controller for up to 64 Bus Terminals
BC8050 RS485 “Compact“ Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension)
BC8150 RS232 “Compact“ Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension)
Fieldbus Box
IPxxxx-, IL230x-B730 Fieldbus Box modules for Modbus