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CS 31
NCSA-01
NCSA-01 Installation and Start-up Guide
This chapter contains a short description of the CS 31 bus and the
NCSA-01 CS 31 Adapter Module, an option package delivery checklist,
and warranty information.
ABB Procontic CS 31 is a decentralised automation system. A typical
CS 31 system consists of a Central Processing Unit and remote input/
output units connected by serial communication bus. Using the CS 31
connection it is possible to handle a large amount of distributed
process I/O in one central unit.
The physical transmission medium of the bus is a twisted pair cable
(according to RS 485 standard). The maximum length of the bus cable
is 500 metres and the transmission rate is 187.5 kbitps.
From the bus administration point of view all the remote units are slave
stations. No communication between the slaves is possible. There is
one master station – a CS 31 central unit – which polls the slave
stations cyclically.
All messages from the master carry an address. The slave (remote
unit) with this address receives the message and sends a response
message back to the master. The master updates the system image
continuously.
For more information on the CS 31 system, refer to Technical
Documentation FPTN 440 004 R2001-a, available from ABB Control
(France).
The NCSA-01 CS 31 Adapter Module is an optional device that
enables connection of an ABB drive to a CS 31 system. The module is
considered as a remote input/output unit in the system. A total of 30
remote units (e.g. NCSA-01 Modules) can be connected to one CS 31
master. (This is an electrical limit as each remote unit weakens the bus
signal.) By default, the master writes the reference values to the drive
every 6 milliseconds.
Through the NCSA-01, it is possible to
• Give control commands (Start, Stop, Run enable, etc.) to the drive
• Give a motor speed or torque reference to the drive
• Read status information and actual signals from the drive
• Reset a drive fault.
The adapter module can be mounted onto a standard mounting rail
inside or outside the drive unit, depending on drive type and
Chapter 2 – Overview
2-1
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