(ADD) instruction in function block

knucklebucket

Member
K
Join Date
Feb 2013
Location
Greeneville, Tennessee
Posts
54
I know this sounds really stupid, but I have a function block program I have written and have been debugging. I have an ADD block that will not work?

my input for source A and source B are functioning correctly via inputs from HMI. but the ADD block will not output the result? I am at a loss, this should be very simple. any help would be appreciated.
 
I have tried both ways Lynx, nothing seems to allow the output to work. If you look at the properties window, the values for source A and source B do not show up in the properties window, seems like they should.

ADD Block parameters.JPG
 
Source A & B should be reals, it looks like you are feeding them with integers, I do not know what PLC you are using but in most I have used this would cause a compile error, try converting the integers to reals first.
 

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