himalay_sharma
Hi Karim, Great explanation about the ladder logic. I have one question about reading the ladder diagram which has ONS instruction in it, Can you please help me how to read the PLC scan cycle if only One Bit Rise in one PLC cycle.
Hi Karim, Great explanation about the ladder logic. I have one question about reading the ladder diagram which has ONS instruction in it, Can you please help me how to read the PLC scan cycle if only One Bit Rise in one PLC cycle.
When you push I:0.0/0, the B3:0/1 will turn on one-scan (one shot) of PLC scanning. During that scan, the O:0.0/0 will turn on. During next scan of PLC, at first B3:0/1 will turn off. It does not matter how long you hold the button. then when PLC scan the second rung, the lower part of rung will run through power while (O:0.0/0 was ON last scan). It will hold the output.
By the way, normally we used Normally Closed Contact for a physical stop button. Therefore, the stop button in the logic should be normally open contact (XIO).