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Dynamic Testing

Consists of processor routines in conjunction with external hardware under PLC control. General guidelines for dynamic testing of critical inputs and outputs are described below.

  • Critical Inputs
    • Procedure - Disconnect inputs to Module A. Check for zero on all inputs.
    • If test fails, disable inputs and generate alarm.
    • If test succeeds, reconnect inputs and repeat for Module B.
    • PES Files: Store results of tests.
  • Critical Outputs
    • Procedure - Check that Module B is energized. If B is enabled, disable Module A. Check that A outputs are deenergized (through feedback via input module).
    • If test fails, disable outputs and generate alarm.
    • If test succeeds, reenergize outputs and repeat for Module B.
    • PES Files: Store results of tests.