Hello, i'm israr from 8th semester eee. i chose automated railway gate control using plc (ge versamax) as my project. i used ir sensors to detect train and send signal to open the gate. so far in the input side there is no problem at all. but the output , that is a l293d driver controlling dc geared motors i don't know how to connect the l293d to the plc output. in l293d there 4 input terminals. 2 for each and you are suppoesed to give '0' that is a ground signal to i1 or i2 to operate in anti and clockwise respectively. but how do i give this 0 signal to l293d from output of plc. i tried giving a reset signal, it doesn't work. only when i give common ground to i1 or i2 , it works.
please do help me