Technical information

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3/223/22
Presentation
Modicon M340 automation
platform
RTU communication systems
Processors:
page 1/2
I/O:
pages 2/2 and 2/14
Software:
page 4/2
Ruggedized Modicon M340 modules:
page 6/2
Presentation
RTU systems are designed to meet the needs of the water industry, the oil and gas
sector and other infrastructures, where remote monitoring and telecontrol are
essential to the good management of sites and substations spread over a wide
geographical area.
RTU protocols and Telemetry systems provide robust, reliable means of communication
which are suitable for the process values, maintenance and remote monitoring needs
of infrastructures disseminated over a vast geographical area which may be difficult
to access.
An RTU system consists of the following elements:
A Telemetry Supervisor (SCADA) in a central control room
A network infrastructure and a variety of suitable communication methods
(LAN, WAN, modems, etc)
A large number of RTU substations geographically distributed throughout the field
Ethernet 2
Ethernet 1
RTU RTU
RTU
RTU
RTURTURTU
RTU
RTU
TCP/IP, LAN/WAN, XdSL or Serial networks
PSTN (Public Switched Telephone Network) or GPRS/3G modem connections
Radio modem connections
SCADA master station
Radio network 1
Radio network 2
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Main functions
The main RTU system functions are as follows:
Remote communications:
Between remote RTU sites (coordination, synchronization)
With the SCADA host system, controlling the central operator station (monitoring,
alarm reports) and centralized databases (archiving of alarms or events)
With the on-call staff (alarm indication)
With the technical station (diagnostics, maintenance)
Data acquisition, processing and memorization:
Process data sampling using standard or dedicated sensors, validation
Exchange of data with other devices within the station, including controllers and
operator consoles
Use of digital or analog I/O, serial links, fieldbuses and LANs
Event detection, time and date stamping, prioritization and logging as required by
the application
Other functions:
IEC 1131-3 programmable control: forcing, access control, load sharing, servo control
Data logging
Alarm and report notification by e-mail/SMS
Web HMI: displaying the process, alarm handling, trend analysis, telecontrol
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Example of an RTU system architecture