- normally - closed contact.


This element has two entrances. First - controlled, second - login normally - closed contact. If the input value IN0 is served other than INFINITY, then break contact and at the outlet of the element value OUT INFINITY. If managers input value INFINITY (uncertainty), the output OUT = IN1. Example of using this element can be explained in the following example. By changing the values on an element of the condition can be obtained with two options:
first - the condition is not fulfilled, then the element does not upravlyaeschego signal at the output OUT to the input value IN1. 3 lights is glow;

second - in the fulfillment of the conditions under controlled IN0 input signal and the element break contact, the output value of INFINITY. 3 lights is no lights.