Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 62

General requirements must include minimum qualification criteria for selection of a system integrator when the contract requires one. The specifications should follow design standards established for the project and include compliance with relevant industry standards. At a minimum, design standards should address

• Power supply requirements, including uninterruptible power supplies (UPSs) required for an automation system;

• Response to power failures;

• Hardware redundancy;

• Surge and lightning protection for panels and instruments; and

• Signal requirements for instrumentation and control (e.g., field bus, traditional 4 to 20 m for analog, highway addressable remote transducer [HART] communication, etc.).