Controls News 13
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Technical support:
HVAC applications in the data processing centres
Implementation
Even if the aforementioned specifi-
cation and planning assistance from
BITKOM (Federal Association for Infor-
mation Technology, Telecommunica-
tions and New Media) with respect to
redundancy, fault tolerance, etc. of the
HVAC application specify no details, in
practice the following applies: FromTier
II, CPU (PLC) redundancy is required,
and from Tier III the I/O level and the
rest of the cabinet infrastructure must
also be redundant. The redundancy
requirement from Tier III means that
two identical control panels must be in-
stalled. The PCD of the two control pan-
els must have the same program and
must be synchronized in the exchange
of data. If one control panel is out of
order or undergoing maintenance, the
second one takes over. This is how the
data center of EUMETSAT (European Or-
ganisation for the Exploitation of Mete-
orological Satellites was planned by dc-
ce RZ-consulting; it is currently being
built by TOBOL Control GmbH Darm-
stadt. It is important that data exchange
is itself redundant. This can be achieved
with data exchange over Ethernet and
RS 485. For tier II classification, only
the CPUs need to be redundant, as it
is possible to work with an I/O level.
This can be achieved by coupling the
I/Os to separate PCDs or a Smart-RIO-
PCD3.T6xx. The free programmabil-
ity and communication options ensure
that the automation technology can
integrate seamlessly into the IT infra-
structure as far as the I/O level.
Additional features of data centres
According to a survey by online
specialist magazine «Data Center
Knowledge», Data Center Infrastructure
Management is the fastest-growing
area of interest of operators of «Enter-
prise Class» data centres (Source: http://
.
The aim is to integrate themanagement
of the IT infrastructure and buildings in
order to use a data centre as efficiently
as possible. In practice this means that
the automation station must support
a variety of interfaces, buses and pro-
tocols to communicate with all field
components and assemblies, which
they must also be able to process and
forward FOR IT PURPOSES. Ultimately,
the IT department wants to have overall
transparency so that know the status of
each assembly, but they want as little as
possible to do with ICA. To achieve this,
you have to speak their language. Only
mention the SNMP protocol, which is
widespread in IT management, or FTP,
which allows data to be used at the
management level directly as Excel-
readable files. This is everything that a
PCD supports by default. The issue of
energy efficiency is becoming increas-
ingly important, even in data centers,
whose power consumption is in creas-
ing steadily worldwide. Measures for
energy efficiency can make a major
contribution to reducing consump-
tion and operating costs. With a PCD or
S-Energy Manager together with ener-
gy meters and communication interfac-
es, values can be measured, stored and
forwarded very simply. Thus, irregulari-
ties or peaks can be identified and the
necessary measures taken.
Summary
Data centres make major demands on the application in terms of uptime.
But they are not from another planet. Saia® PCD has the technology re-
quired. Reliable hardware, free programmability and support for IT proto-
cols. Saia® PCD offers all this as standard. Energy recording and monitoring
is included. It can never offer «multiple redundant»» and «failsafe» technol-
ogy, because the system is affected by the external environment. You can
read more about energy monitoring and optimization in data centres in the
reference report on page 48.
Wusys Video: web code en13124a
Reliable data centres
Source:
_
Planungshilfe_Betriebsicheres_Rechenzentrum_2011.pdf
Federal Association for Information Technology,
Telecommunications and New Media
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