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Instrumentation and Controls Considerations
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Design Considerations - index
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Input/Output Controller


DOE-HDBK-1132-99
maintenance considerations;
aesthetics;
lighting methods and intensities;
communications facilities;
control center location relative to the rest of the plant;
control center access and egress pathways;
security and safety considerations;
office and utility room requirements;
computer room;
software engineering area;
ambient noise levels and abatement devices;
HVAC requirements-ambient temperature, air quality, and humidity;
fire protection requirements;
wiring methods and requirements (including fiber optics);
static electricity discharge requirements;
grounding requirements;
essential documents storage and reference area;
electromagnetic compatibility;
human factors/ergonomics (see IEEE-1023, ISA RP60.3);
power requirements.
To increase the reliability of control systems, redundancy of primary control system
components (power supplies, controllers, input/output modules, communication lines,
etc.) should be considered. Facility failure studies can be useful in defining control
system redundancy needs.
Distributed Control Systems (DCSs) . The following should be considered for
4.2
specifying or purchasing a DCS.
4.2.1
Component Modularity . System components are generally standardized,
modular, and of plug-in construction, so that any module may easily be removed
from the system and replaced without breaking or making solder-type
II-41


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