Ethernet; Transmission Media; Diagnostics - ABB AC500 Introduction Manual

Brief information about Ethernet

Ethernet

Ethernet operates with a data rate of 10 MBit/s and as Fast-Ethernet with 100 MBit/s. Ethernet utilizes
the producer/consumer model. This means that every station possesses equal rights. While it is
transmitting, all other stations listen in and accept the data directed to them. Bus access is regulated by
the CSMA/CD procedure (Carrier-Sense Multiple-Access with Collision Detection), where each station
may autonomously transmit when the bus is free. If a collision occurs, if two stations begin to transmit
simultaneously, both of them will stop transmission and wait for a randomly determined time before they
transmit again. Ethernet defines the Layers 1 (Physical Link) and 2 (Data Link) of the OSI model.
The AC500 supports transmission and reception of data using TCP/IP and/or UDP/IP. Further
application layers can be implemented by subsequent loading. Simultaneous operation of TCP/IP,
UDP/IP and application layer is also assured. The IP, TCP, UDP, ARP, RP, BOOTP, and DHCP
protocols are supported as a standard feature, as application layer Modbus/TCP.
Topology
Star- or ring-shaped using Ethernet hub or switch.
Data transmission
Max. 10 MB/s with 10 Base T and max. 100 MB/s with Fast-Ethernet.

Transmission media

Twisted-pair cables with RJ45 connector. The maximum cable length is 100 m for 100 MB/s.

Diagnostics

Detailed diagnostic messages for rapid trouble-shooting are shown on the CPU display or can be called
using the programming tool. In addition, the device status is indicated at the communication module by
four LEDs.
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Introduction to AC500 1-12
AC500 / Issued: 07.2006