question archive Construct a ladder diagram - CTU counter operation (ascending) Description The ladder diagram will contain: One CTU: C5: 0 counter instruction
Construct a ladder diagram - CTU counter operation (ascending) Description The ladder diagram will contain: One CTU: C5: 0 counter instruction
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Construct a ladder diagram - CTU counter operation (ascending) Description
The ladder diagram will contain: One CTU: C5: 0 counter instruction. Five normally open contacts (XIC): I: 0.0 / 0, I: 0.0 / 1. C5: 0. DN C5: 0. OV, C5: 0.CU. Three coils (OTE): O: 0.0 / 0, O: 0.0 / 1, O: 0.0 / 2. A reset instruction (RES): C5: 0.
The program will do the following:
1.- Each time the I: 0.0 / 0 contact opens and closes, the Meter will receive a pulse that will set the CU register and the O: 0.0 / 2 coil on high for the duration of the pulse.
2.- At the same time as the above, the accumulator increases its account by one unit.
3.- As soon as the accumulator reaches the preset count value (C5: 0. ACC = C5: 0. PRE = 4) the DN register and the coil O: 0.0 / 0 go high.
4.- The counter can continue accumulating if it continues to send pulses. You can accumulate the count of 32 767. And when you reach this number the OV register will become one (or true), and will activate the coil. 5.- To reset the program, it is necessary to close the contact I: 0.0 / 1 to activate the output instruction RES.
