Contemporary Control Systems BASremote Application Guide - Manual (Page 8)

AG-BASR0000-BC0 Page 8
Application Guide — BASremote
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ONTR LS O
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CONTEMPORARY
Application #4 — Energy Usage Sub-metering
The BASremote Master can be used as a data
concentrator for sub-metering applications. With
sub-metering, tenants can be billed a portion of the
actual energy usage based upon individual usage.
Sub-metering can also verify actual energy savings
from “green” initiatives. Usually a pulse is generated
from natural gas, water, or electrical meters which need
to be captured and accumulated in order to determine
energy usage. One pulse represents a unit of energy
usually requiring a scaling factor to be applied. The
BASremote Master can be configured through web
pages to handle up to six pulse inputs with independent
threshold settings in order to adapt to different styles of
meters. For convenience, both pulse rate (power) and
accumulation (energy) can be displayed on a
BASremote Master web page after applying a
meaningful scaling factor to the raw data. Sedona
Framework can also be used to calculate beyond simple
scaling. Internally, pulses are accumulated indefinitely
until reset by a supervisory controller or through a
protected web page. Pulse data cannot be lost due to
inadvertent power loss because it is stored in nonvolatile
memory. If special energy demand monitoring is required,
this can be accomplished using a Sedona Framework
program in the BASremote Master or with a program in a
supervisory controller.
The more sophisticated electrical meters have a
Modbus Serial interface which can be attached to the
BASremote Master MB port. Using either the router or
gateway functionality of the BASremote, energy usage
data can be presented to a supervisory controller over
Ethernet.
Application #5 — Power over Ethernet (PoE) for a “One Cable Solution”
The Power over Ethernet standard (IEEE 802.3af) gives
the system integrator another opportunity to be
imaginative. With PoE, both 48 VDC power and Ethernet
communication reside on the same cable. PoE power is
derived from Power Sourcing Equipment (PSE). This
could be an Ethernet switch, a multi-port mid-span PSE,
or a single-port PSE commonly referred to as a Power
Injector. Regardless of the PSE, the BASremote PoE
performs the duties of a Powered Device (PD) in that it
can still communicate over Ethernet while powering its
own electronics plus any devices connected to its auxiliary
24 VDC power supply. The BASremote PoE has identical
capabilities as the BASremote Master but without the
need for a power input connection. By using an
uninterruptable power supply (UPS) at the PSE source, it
is possible to guard the BASremote PoE against any
power failures. This arrangement could be attractive in
critical control or security applications.
EIPE PoE Injector
Simply make a connection from a
PoE compliant device to the
Ethernet port on the BASremote
Saves from purchasing proprietary
BAS cabling and the associated cost of
installation. May gain you points toward
“green certification”.
Both the BASremote and
field devices can be
powered from the data cable
One-Cable Solution
Data & Power on One Cable
Power Over Ethernet
BASremote Master PoE