ASHRAE Journal - September 2014 - 70
TECHNICAL FEATURE
smoke control system and over pressurized the
TABLE 2 Critical systems tiers.
floors so occupants couldn't get out of the buildTIER REDUNDANT
REDUNDANT REDUNDANT REDUNDANT REDUNDANT REDUNDANT
ing? Is that a valid concern?
CRITICALITY
POWER COMMUNICATION SUPERVISORY
FIELD
CONTROL
CONTROL
What if an employee finds out he is losing his job
TRUNK CONTROLLER CONTROLLER
DEVICES
SENSORS
and in retaliation causes equipment to fail (this
TIER 1
ü
ü
û
û
û
û
recently happened at a hospital in Texas)? What
if that disrupts a $5 million dollar web server that
TIER 2
ü
ü
ü
û
û
û
maintains e-commerce site? What if the employee
deletes the audit trail showing that he did this?
TIER 3
ü
ü
ü
ü
û
û
With the advances in technology, systems are
TIER 4
ü
ü
ü
ü
ü
ü
more complex. We no longer have the luxury
of stand-alone pneumatic systems and vacuum
tubes. Your design must not only make systems
run effectively but now must consider the threats to the
or my clients don't care about this stuff." Or a few of you will
system controlling the systems. It's enough to make your read this and you will start thinking differently, engineermind spin.
ing differently, and your value will shine through.
After reading this, one of two things will happen. You will
Low profile penetrations of buildings have already
either dismiss what I wrote in this article saying something occurred. Eventually, someone will penetrate a high
along the lines of "This is interesting stuff but this guy
profile BAS and cause havoc. Ultimately, the question is
either, doesn't understand the space, this is too expensive,
not if, but when.
www.info.hotims.com/49808-67
70
ASHRAE JOURNAL
ashrae.org
SEPTEM BER 2014
ASHRAE Journal - September 2014
Table of Contents for the Digital Edition of ASHRAE Journal - September 2014
Contents
ASHRAE Journal - September 2014 - Cover1
ASHRAE Journal - September 2014 - Cover2
ASHRAE Journal - September 2014 - 1
ASHRAE Journal - September 2014 - 2
ASHRAE Journal - September 2014 - Contents
ASHRAE Journal - September 2014 - 4
ASHRAE Journal - September 2014 - 5
ASHRAE Journal - September 2014 - 6
ASHRAE Journal - September 2014 - 7
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ASHRAE Journal - September 2014 - SCover1
ASHRAE Journal - September 2014 - SCover2
ASHRAE Journal - September 2014 - S1
ASHRAE Journal - September 2014 - S2
ASHRAE Journal - September 2014 - S3
ASHRAE Journal - September 2014 - S4
ASHRAE Journal - September 2014 - S5
ASHRAE Journal - September 2014 - S6
ASHRAE Journal - September 2014 - S7
ASHRAE Journal - September 2014 - S8
ASHRAE Journal - September 2014 - S9
ASHRAE Journal - September 2014 - S10
ASHRAE Journal - September 2014 - S11
ASHRAE Journal - September 2014 - S12
ASHRAE Journal - September 2014 - S13
ASHRAE Journal - September 2014 - S14
ASHRAE Journal - September 2014 - S15
ASHRAE Journal - September 2014 - S16
ASHRAE Journal - September 2014 - S17
ASHRAE Journal - September 2014 - S18
ASHRAE Journal - September 2014 - S19
ASHRAE Journal - September 2014 - S20
ASHRAE Journal - September 2014 - S21
ASHRAE Journal - September 2014 - S22
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ASHRAE Journal - September 2014 - Cover3
ASHRAE Journal - September 2014 - Cover4
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