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I am just starting but I have problem with logic

I try many times but I can't  make logic working the coil is always not set.

At test mode you can see red line does not go  through  coil and on controller no out put led indication. 

How ever if I force output I can see change on controller  led indication 


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Your logic says either I 48 or MB 48 must turn on to latch O 48. If you are activating either of those bits and O 48 is not coming on then you have one of two things occurring:

1) An O 48 coil is elsewhere in the program and is being turned off, or

2) This logic is in a subroutine and the subroutine is not being called by the Main routine.

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