Wireless Networks in Process and Telemetry systems. Etienne Clauw Sales Manager Semaphore - Australia August, 2008

Transcription

1 Wireless Networks in Process and Telemetry systems Etienne Clauw Sales Manager Semaphore - Australia August, 2008

2 Agenda Case for Wireless Wireless technologies Product offerings Network topology Protocols Security balance IT network Standards Summary

3 Case for Wireless Wired systems Direct Full spectrum available from Serial RS232, 485, Leased line, PSTN, Ethernet, copper and fibre Higher speeds up to Giga bit Easier to check comms path No obstructions

4 Case for Wireless Wireless systems No Direct link available Cant run a cable (Expense or Access) Mobile process plant Remote site Modular plant components Mobile maintenance Mobile SCADA

5 Wireless technologies VHF Radio MHz UHF Radio Data licences Spread Spectrum Radio Ethernet 2.4G WLAN WiFi 2.4G WiMax Bluetooth 2.4G I.R. GSM / CDMA 3G / NextG Satellite

6 Wireless products Communication Modems I/O devices I/O Modems Instruments Controllers Data Loggers

7 Radio Licenced UHF Radio 450 and 900MHz Long range (50-80Km) Up to 5 Watts Licenced by ACMA Serial interface Up to 19.2K Site to Site data Security based on Protocol

8 Radio Un-Licenced Spread Spectrum Radio 900MHz ı Up to 64Km ı Up to 1 Watt ı Unlicenced ı Up to 115K ı US Aus GHz ı Up to 16km ı 50mW ı Unlicenced ı Up to 115K Site to site data Integrated I/O and modem Security encryption available

9 Wireless Ethernet WLAN WiFi WiMax Unlicenced 2.4GHz b (also referred to as High Rate or Wi-Fi) External and embedded Wi-Fi products make it easy to add embedded a/b/g wireless LAN networking to any electronic device, or to connect serial devices over a Wi-Fi network.

10 WPAN Blue Tooth Unlicenced 2.4GHz Low power Short range Typically used for Local data connection Monitoring packages with PDA support for mobile maintenance Older system used Infra Red for local programmer

11 WiFi WiMax range

12 Topologies Point to Point Point to Multi Point Mesh

13 Protocols Plant ı Modbus ı HART ı DeviceNET ı Profibus ı TCP/IP Regional ı Modbus ı DNP3 ı IEC60870 ı Proprietary

14 Interoperability reless_coop.html Three leading organizations Fieldbus Foundation (FF), HART Communication Foundation (HCF) and Profibus Nutzerorganisation e.v. (PNO), have formed a Wireless Cooperation Team to collaborate on wireless technology in the manufacturing and process industries a step to deliver consistent functionality to end users.

15 GSM / GPRS Used for remote monitoring and data transfer Limited range (Time based) Connects at Serial speeds Operated by Network provider Telstra Optus Etc GPRS for control data requires specialised personnel

16 3G / Next G Used for remote monitoring and data transfer Extended range. Can use high gain antennas Connects at Ethernet speeds Operated by Network provider Telstra (Next G) Optus Etc Still requires specialised personnel to set up complete network

17 3G / Next G Full range available Low power OEM style Packaged Modems Higher performance Modems with I/O on board High availability via managed modems Suppliers ı Wavecom, Maxon, Call Direct, Land cell Cybertec, and Telstra Ultralink.

18 Communication networks Emerging systems IT NETWORK 3G SCADA SCADA INTERNET MASTER RTU MASTER RTU PLC EVENT LOGGING WEB SERVER ALARM SYSTEM SECURITY SYSTEM 3G RADIO Remote I/O REMOTE FLOW METER PUMP CONTROLLER USD I/O BUS

19 Antennas Your whole wireless system depends on the quality of your antenna Test your installation in worst conditions Know the limits of the Frequency band that you are operating over. For in plant systems direct connection is OK. For outside systems recommend use of Lightning arrestors Use Radio installation contractors Height is King, (Line of sight where possible)

20 Application Overview Current systems SCADA, Reporting, Alarming High speed Radio, 3G, Ethernet PLC RTU DATALOGGER PAGER AUTODIALER DIRECT I/O COMMS I/O

21 Application Overview Emerging systems SCADA, Reporting, Alarming Radio, PSTN, GSM/GPRS, Ethernet PLC RTU DATALOGGER PAGER DIRECT I/O COMMS I/O

22 Application Overview Future merged system SCADA, Reporting, Alarming Radio, 3G, Ethernet PLC RTU DATALOGGER PAGER DIRECT I/O COMMS I/O VIDEO SECURITY

23 RTUs Control & Publishing of data Future Directions Web enabled technologies Embedded HTML page View parameters Device Control World Wide Web HTML editor

24 Security Keeping systems in balance Security levels ı Asset security ı Controller security ı Communication security Authentication Dual Networks - Distributed control Reduce critical communication traffic Pass control back to the remote controller

25 Security On Wireless systems Utilising the standard, connectivity to any wireless device has levels of security. These measures allow users or remote computers and/or users to connect allowing data transfer and remote configuration and maintenance. Once this authentication is verified than any typical action that you may do on your corporate network can be accessed. Using the modems firewall settings, all ports can be locked out and only allowing connections to assigned machines. You may choose to allow or deny... File transfer Protocol data only (DNP3, Modbus etc.) Video streaming (Dependant on speed of connection) Advanced Metering

26 IT / Corporate network Typically as wireless technology is converted into TCP/IP, connectivity to a LAN is very easily achieved. Maintaining/Updating existing, or developing new company Security Policies should be the guideline to adhere to. Connectivity to IT/Corporate or any network that is outside the typical SCADA environment, should be done so with the use of a protocol aware Firewall. If your firewall does not support such protocols as DNP3, these can be written as a Custom Firewall Rule utilising the correct ports.

27 SCADA / IT SNMP SNMP Simple Network Management Protocol Widely used in IT and broadcast networks Unified mechanism for monitoring and management Ethernet IP-based protocol Operates over UDP (connectionless) Multiple versions 1, 2c and 3

28 SCADA / IT SNMP Concepts All elements of configuration and operation available for management through SNMP are described as objects and have unique identifiers called object identifiers. Objects are arranged in a hierarchical manner described in the management information base (or mib) for a device.

29 SCADA / IT Management Information Base ASCII based definitions. Describe the objects available for configuration, monitoring and management within an SNMP agent, data types and access restrictions. Example objects include system uptime, current date and time, last configuration date and current system settings.

30 SCADA / IT MIB Browser Wide range of tools available to provide interface to SNMP devices based upon device MIB files Example MIB Browser (Java, cross-platform)

31 Summary Keep informed Assess need for Wireless Understand the different technologies Review the data and rate Trial the system first Aim for interoperability Review path obstruction Choose correct antenna Keep maintenance staff trained Keep spares

32 Contact information Etienne Clauw