Question

3. Assume that TAG IN status in Figure below is true. Words N7:4 and N7.5 contain the value for tank 1 and tank 2 levels. Under what condition(s) MOTORI will run. L10 B300 묩-3 E TAG N Souce Grtr Than or Egl N7.4 Souree B N7.S 020 83.00 MOTOR1

Answer 1

The value in source(N7.4) is greater than or equal to the value in sourceB(N7.5) Then GEQ instruction is true.

if GEQ instruction is true B3.0/0 is true. By providing B3.0/0 to the NC contact, it will open and motor will off.

Motor will on only under GEQ false conditions. When the value in source (N7.4) is less than the value in sourceB(N7.5). The GEQ instruction is false.

if GEQ is false B3.0/0 is in false condition(0). By providing B3.0/0 to the NC contact it is in close condition. Therefore motor1 will on.