TXP-CLC Course
Industrial Ethernet designed to be used as
plant bus and terminal bus
The bus system in TXP comprises two separate buses, the terminal bus and the
plant bus. This allows de-coupling of the distinct communications procedures.
Communication between the automation systems and between the AS620, the
processing unit (OM650/PU), ES680, and DS670 takes place via the plant bus.
Communication between the OM650/PU/SU, ES680, DS670, and the OT’s takes
place via the terminal bus.
The SIMATIC NET™ Industrial Ethernet can be implemented in both cases.
The system architecture comprises:
• The transfer medium that implements the physical structure of the bus
with the appropriate connection and transfer components
• Active bus components via which TXP participants are connected to the
bus
• Communications protocols that support the structured exchange of data
between TXP participants
• Configured links that describe communications applications between TXP
participants
The CSMA/CD (Carrier Sense Multiple Access with Collision Detection) access
procedure is used on the bus system uniformly by all TXP participants
independent of the physical variants of the bus (drop cable, industrial twisted pair
or fiber-optic cable).
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