Modicon X80 IO Platform Page 4-10 Communication

4/10 Presentation Modicon X80 I/O platform RTU communication systems 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: b A Telemetry Supervisor (SCADA) in a central control room b A network infrastructure and a variety of suitable communication methods (LAN, WAN, modems, etc) b A large number of RTU substations geographically distributed throughout the field Ethernet 2 Ethernet 1 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 Main functions The main RTU system functions are as follows: b Remote communications: v Between remote RTU sites (coordination, synchronization) v With the SCADA host system, controlling the central operator station (monitoring, alarm reports) and centralized databases (archiving of alarms or events) v With the on-call staff (alarm indication) v With the technical station (diagnostics, maintenance) b Data acquisition, processing, and memorization: v Process data sampling using standard or dedicated sensors, validation v Exchange of data with other devices within the station, including controllers and operator consoles v Use of discrete or analog I/O, serial links, fieldbuses, and LANs v Event detection, time and date stamping, prioritization, and logging as required by the application b Other functions: v IEC 1131-3 programmable control: forcing, access control, load sharing, servo control v Data logging v Alarm and report notification by e-mail/SMS v Web HMI: displaying the process, alarm handling, trend analysis, telecontrol Example of an RTU system architecture Compatibility: page 1/6 Racks and power supply modules: page 2/2 I/O modules: page 3/2 Ruggedized modules: page 5/2 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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