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Section 3.1.4.1, S100 I/O System
Section 3.1.4.2, S400 I/O System
guide you in selecting suitable I/O for an application and some design rules.
By way of introduction, the question of centralized I/O or distributed I/O is discussed.
A combination of centralized I/O and distributed I/O can often be an appropriate solution.
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The traditional method of building control equipment with a central assembly of all electronics
in the control or equipment room is still the most common. There are several reasons for this:
•
Not all processes are suitable for distribution of I/O functions. In some cases, safety or
environmental requirements with respect to equipment and maintenance personnel may
make a process unsuitable.
•
The geographical spread of the process is often limited.
•
It may be necessary to supplement a central operator’s function (including a display
screen) with a conventional panel function independent of the control system.
For example, a panel instrument in a current loop showing a process measured value
which is to be placed in the central control room.
•
The control system interacts closely with central switch gear for control of the motor
supply.
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Cables and wiring represent a large part of the costs of a control system. It is, therefore,
an obvious advantage if a communication bus can transport a large number of signals between
an Advant Controller 450 and a distributed I/O unit and have separate signal leads only between
the I/O unit and the process. The wider the process is dispersed geographically, the more
profitable distributed I/O becomes.
The option to supplement the distributed I/O function with independent small controllers for
fast logic control makes this type of system configuration even more attractive economically.
The control in the distributed controller can, in addition, be integrated with the Advant OCS.
In connection to a revamp, you can locate distributed I/O units in an existing marshalling area as
interface between an old installation and a new control system.
Summary of Contents for Advant Controller 450
Page 1: ...Advant OCS with Master software GYDQW RQWUROOHU User s Guide 3BSE 002 415R701 Rev A ...
Page 26: ...Advant Controller 450 User s Guide Table of Contents 3BSE 002 415R701 Rev A xvi ...
Page 30: ...Advant Controller 450 User s Guide Table of Contents 3BSE 002 415R701 Rev A xx ...
Page 488: ... GYDQW RQWUROOHU 8VHU V XLGH SSHQGL DUGZDUH 0RGXOHV A 48 3BSE 002 415R701 Rev A ...
Page 508: ...Advant Controller 450 User s Guide Appendix D Item Designations D 12 3BSE 002 415R701 Rev A ...
Page 518: ...Advant Controller 450 User s Guide Appendix F Load Calculation F 4 3BSE 002 415R701 Rev A ...
Page 522: ...Advant Controller 450 User s Guide Appendix G Memory Calculation G 4 3BSE 002 415R701 Rev A ...
Page 528: ...Advant Controller 450 User s Guide Appendix H Halt Codes H 6 3BSE 002 415R701 Rev A ...
Page 562: ...Advant Controller 450 User s Guide Index iv 3BSE 002 415R701 Rev A ...
Page 563: ......
Page 564: ...3BSE 002 415R701 Rev A March 2000 ...