#interval layer communication interface

4 General provisions 4.1 General requirements for protective devices

4.1. 1 The single-point digital input of the protection device is defined by positive logic, that is, the contact is closed as “1” and the contact is opened as “0”. The definitions of digital inputs “1” and “0” are uniformly defined as follows: a) “1” affirmatively expresses the function; b) “0” negates the expressive…