Energy Measurement and Management - Iskraemeco UK

Energy Measurement and Management
P2LPC data concentrator is intended
for automatic reading of data from
Mx3y1 family of electricity meters in
the AMM-system. The communication
with electricity meters runs
through low voltage network (DLC)
in accordance with the communication
protocol DLMS/COSEM. P2LPC
also allows the reading of electricity
meters (Mx372, MT83x) via the
RS485 communication interface.
P2LPC is based on single-board
computer (SBC), which operates on
Microsoft Windows CE operating
system. Application in P2LPC is
responsible for searching, reading
and maintaining two-way communication
with electricity meters, to
store obtained data in internal memory
as well as for data transfer to an
assembly center. For communication
with the center for data collection
there are different communication
paths available - GSM, GPRS
and Ethernet, using standard
Internet protocols - PPP, TCP/IP,
FTP and WebService.
P2LPC
Data concentrator for AMM-systems
Operating System
WEB
DLC modem for communication with the
meters
CENELEC frequency band A
(from 9 to 95 kHz)
Communication protocol for communicating
with the meters
Integrated GSM / GPRS modem for two
frequencies
File transfer protocol to the center
Data transfer and meter management with
WEB-stations
■ Communication with the meters over the DLC network
■ »Plug and Play« – automatic search for new meters, log into the system and logout
from it
■ Saving Data to indelible memory
■ Communication with the center via GSM, GPRS and Ethernet communications
■ DLMS/COSEM - protocol for communication with the meters
■ Standard Internet protocols (PPP, TCP/IP, FTP and WebService) for communication
with the center
■ Microsoft Windows CE operating system
■ Remote control over P2LPC and its operation management

P2LPC
CONCENTRATORS ESSENTIAL FUNCTIONS
P2LPC application runs on a single-board computer (SBC) on Microsoft Windows
CE as multithreaded applications, while threads can be implemented simultaneously.
Each of them is responsible for its function. Functions are as follows:
DLC-network management: Search, installation and deinstallation of meters.
Verification of quality of communication between P2LPC and meters. When there
are poor conditions in the DLC-network, meters can be automatically placed in
iteration (repeater) mode (up to 7 repetitions). This ensures reliable data transfer
to remote meters, to which direct communication cannot be established, and
also from them. DLC address area allows addressing of up to 3072 meters.
Meters reading: This is a periodic task with adjustable timetable that may consist
of several schedules. Each of them has its own priority. Results from the meters
are stored in result files separately for each meter and for each month.
Communication with the meters is in accordance with the DLMS / COSEM protocol.
A simplified architecture of the OSI model is used, which is defined in the
standards IEC 62056-46 (DATA LINK LAYER USING HDLC-PROTOCOL) and IEC
62056-52. On a physical level P2LPC is using a DLC-modem. The software takes
care of sending and receiving of data via the DLC-modem that operates transparently
to the higher level of communication. On the data level HDLC is using
DLMS protocol. On the aplication level the COSEM protocol is implemented.
Supervision and management of meters: With P2LPC it is possible to remotely
change the configuration of the meter, a tariff schedule, turning the user on or
off, as well as implementation of other operations on demand in real time.
Storage of data: For storage of data Microsoft Windows CE with protected file system
is used. Every month a new result file is created for each meter. There are
three types of files containing different types of data: the state of registries, the
state in the measurement period and events and statuses. All files are stored in a
local indelible memory. To save memory space and minimizing the amount of
transferred data all of these files can be compressed. The size of files stored in
this form for one meter per month is about 10 kB. There is 45 MB of memory
reserved for storing result files. Deleting of older files is automated. The frequency
is set in the parameters of P2LPC.
Communication with the billing center: It is possible using the modem or Ethernet
connection. For the maintenance and control of the modem communication the
Remote Access Server (RAS) and PPP (RFC 1661) protocols are used. When
communicating with the center over GPRS, the P2LPC is establishing and supervising
the connection with GPRS network. For data transfer the TCP/IP protocol
is used. The software package includes several auxiliary applications that take
care of the transfer of metering data and files - FTP and WebService, SNMP for
monitoring and management, and NTP for the control of time functions. For the
transfer and storage of data in billing database the Iskraemeco SEP2WSystem
software is used. The use of open protocol standards enables easy installation
into other systems.
Maintenance, changing the settings and control over the operation can take place locally
through the Ethernet interface or remotely through already mentioned communication
channels. There are various types of information available on the P2LPC such as the list
of installed meters, meters reading schedules, currently running operations and data
files. From the command line it is possible to implement certain commands such as
search for new meters in the system, deinstallation of meters, starting meters reading
schedules, etc. Configuration files can be browsed, such as files for monitoring the
system operation, from which we can see the number of connected meters to the P2LPC,
the time-tag of meter installation and the current quality of communication. There are also
different levels of records to a log-file, through which the functioning of the concentrator
can be analyzed and eventually optimized.
DLC-MODEM
The integrated DLC-modem takes care of the data transfer between the concentrator
and meter through low-voltage network. The communication is serial, asynchronous,
with speeds of up to 1200 bit/s. The actual transfer speed through low-voltage
network depends primarily on the current situation of the network. Sending and
receiving of data are controlled by modem application; broadcast and reception of
data are possible on all three phases.
Type of modulation
»Spread FSK« (S-FSK) with two carriers
(Typically 93,600 Hz and 83,200 Hz – adjustment to user preferences is possible)
Transfer speed
1200 bps through the network (in poor conditions, 300 bps)
The level of transmitted signal
It operates in accordance with EN 50065 standard - broadband modulation
• 134 dB/µV meters – single-phase connection
• 128 dB/µV meters – three-phase connection
• P2LPC-concentrator 128 dB/µV – three-phase connection
The way of connection
Capacitive, galvanic separation
Type of communication
Partial two-way transfer
Communication structure
Master (P2LPC) – Slave (meter)
Repeater mode
Self-adaptive, based on the criteria function (the signal - noise ratio on both carriers)
Rated voltage Un . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3x230/400 V, 3x400 V
Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.8 Un ... 1,5 Un
Rated frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50Hz
Operating temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . .-20 °C ... +60 °C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40 °C ... +80 °C
Own consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 W max.
Low voltage
network
Supply unit
Single
Board
Computer
Windows CE
Eternet
RS232
LAN adapter
RS485
LAN
DLC modem
RS232
RS232
GSM modem
GSM / GPRS
network
722.999.186 1104/10
Owing to periodical improvements of our products the supplied products may differ in some
details from the data stated in the prospectus material.
Iskraemeco (UK) Ltd
Building 1010, Cambourne Business Park
Cambourne, Cambridge, CB23 6DP
Tel.: +44(0)1223 597912, e-mail: sales@iskraemeco.co.uk, http://www.iskraemeco.co.uk
Published by Iskraemeco. Data subject to change without notice.