Pacific Northwest National Laboratory

• 24 pages
• July 7, 2008

SCADA Principles of Operation
Interface with Physical Devices

• Remote terminal unit (RTU)
• Intelligent electronic device (IED)
• Programmable logic controller (PLC)

Communications

• Directly wired
• Power line carrier
• Microwave
• Radio (spread spectrum)
• Fiber optic

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IEEE Standard 1402-2000

IEEE Guide for Electric Power Substation

Physical and Electronic Security

Provides definitions, parameters that influence
threat of intrusions, and gives a criteria for
substation security

Cyber methods considered:

• passwords
• dial-back verification
• selective access
• virus scans

encryption and encoding

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