Brief Information About Cs31 Field Bus; Communication; Topology; Transmission Medium - ABB AC500 Introduction Manual

Brief information about CS31 field bus

CS31 (Communication Serial Field Bus, developed by ABB in 1989) for continuity and
migration
CS31 is a proprietary master/slave field bus. It is characterized by simple handling, easy configuration,
and inexpensive installation. The COM1 interface of the AC500 can be configured as a CS31 field bus
master.

Communication

Is handled using polling, i.e. the master sends a request to the slave and then receives the response.
The CS31 operating mode of COM1 is set using the engineering tool.

Topology

Multi-point line, RS485, approved without branch lines. A system consists of one master and up to 31
slaves. The maximum cable length is 500 m, or 2 km with an amplifier. Slaves are primarily
decentralized input/output modules with integrated CS31 bus connection.
Data transmission
Is performed at 187.5 kB/s. Each telegram has an 8-bit CRC appended. The telegrams enable process
data (input/output data) to be written and read.

Transmission medium

Primarily a twisted-pair, shielded cable with terminators. Other transmission media: fiber-optic cables via
a converter (glass fibers max. 3 km, plastic max. 100 m), contact lines, slip rings (bus length max. 50 m)
and data photocells.
Diagnostics
Detailed diagnostic messages for rapid trouble-shooting are shown on the CPU display or can be called
using the programming tool.
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G1
Introduction to AC500 1-11
AC500 / Issued: 07.2006