PLC design time relay ladder diagram

TON can make = 1 count, count to the set value ( Count up to 32767) , the timer = 1. To reset the can = 0 ( Timer = 0) 。 TOF can make = 1, timer = 1, the counter reset ( Reset) 。 Can make negative jump from 1 to 0, the counter began to count, to the set value ( Stop counting) A = 0, a timer. Figure 1 below: : when enabled = 1, TOF ( T38) Contact action figure figure 2: can make after disconnection, count to the set value, TOF ( T38) The contact action figure ( Including T38 normally open contacts are in enabling negative jump from 1 to 0 after the timer to set value to 0) TONR enabled = 1, counter to start counting, count to the set value, counter = 1. Make can disconnect, counter stop counting, counter is still 1, enabling to 1 again, counter on the basis of the original count count. The above three kinds of counter can be reset by reset instructions. Orthogonal counter before XiangChao B 90 degrees, increases the count of B XiangChao before A 90 degree, reduce count when to change the direction of the count ( Counting increase count or decreases) , as long as A and B phase connection exchange.