Time, Total System Response Time, Digital (TRT)

The time elapsed between a change input signal state at the Field Input Terminals and the corresponding change in the output signal(s) state(s) at the Field Output Terminals. TRT is the sum of all individual (partial) times encountered by the signal (information) as it pass through the PES from the field Input Interface to the Field Output Interface. Generally all partial times may vary depending upon many conditions such as the hardware configuration (e.g., RIOSs communication links that may affect TIT and TQT, the method used to acquire and process data such as periodic scan interrupts, and the instantaneous load of the application program.