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AC500-eCo - 34 -
Hardware Introduction
Point-to-point via RS232 or multi-point via RS485. With RS232, a maximum of one master and
one slave is possible, while with RS485 one master and a maximum of 31 slaves can be
operated. The maximum cable length is 15 m with RS232 and 1.2 km with RS485.
Data transfer
Max. 187.5 kB/s. Each telegram has a 16-bit CRC appended. The telegrams permit process data
(input/output data) to be written and read, either individually or in groups. The data are packed in
the RTU format.
Transmission media
May vary. One widely used option is the RS485 bus physics, a twisted-pair, shielded cable with
terminators.
Diagnostics
Detailed diagnostic messages for rapid trouble-shoot-ing are shown on the CPU display or can
be called using the programming tool.
Brief Information about CS31
CS31 (Communication Serial, 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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