IEC 60671:2007

INTRODUCTION
1 Scope
2 Normative References
3 Terms and definitions
4 Basic Principles for Surveillance Testing
  4.1 General
  4.2 Gradation of Requirements Based on Category
  4.3 Extent of Surveillance Testing
  4.4 Self-supervision in Lieu of Periodic Testing
  4.5 Continuous Operation in Lieu of Periodic Testing
5 General Requirements for Surveillance Testing
  5.1 Design Requirements
  5.2 Procedures
  5.3 Data to be recorded upon detection of a fault
  5.4 Other data to be recorded
  5.5 Test intervals
  5.6 Verification of actuation set-points
  5.7 Bypass
  5.8 Response time
  5.9 Restoration
6 Requirements for Testing of Sensors and Signal Processing
  Devices
  6.1 General
  6.2 Non-tested parts
  6.3 Testing devices
  6.4 Signals
  6.5 Variation of signals
       6.5.1 General
       6.5.2 Slowly changing signal
       6.5.3 Rapidly changing signal
       6.5.4 Large change in signal
  6.6 Operability
  6.7 Sensor response time
  6.8 Testing equipment
  6.9 Calibration and transfer function
  6.10 Surveillance
7 Requirements for Testing of Electromechanical Equipment
  7.1 General
  7.2 Interface
  7.3 Typical functional tests
  7.4 Continuous monitoring
  7.5 Relays and valves
8 Requirements for Testing of Logic Assemblies
  8.1 Scope
  8.2 General
  8.3 Switching of signals
  8.4 Testing signals
  8.5 Interface
  8.6 Data to be displayed
  8.7 Data to be recorded
  8.8 Detailed display
  8.9 Testing equipment
  8.10 Testing equipment using pulses
9 Self-supervision in computer-based I&C systems
  9.1 Coverage of self supervision
  9.2 Balance of diagnostic versus functional processing
  9.3 Watchdog timers
  9.4 Action taken on detected fault
  9.5 Categorization of self-supervision software

Lays down principles for testing I&C systems performing category A, B and C functions, per IEC 61226, during normal power operation and shutdown, so as to check the functional availability especially with regard to the detection of faults that could prevent the proper operation of the functions important to safety. Covers the possibility of testing at short intervals or continuous surveillance, as well as periodic testing at longer intervals. It also establishes basic rules for the design and application of the test equipment and its interface with the systems important to safety. The main change with respect to the previous edition includes an extension of the scope to cover all systems important to safety, and a requirement gradation for systems and equipment performing category A, B and C functions.