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a strange error in calculation

9/19/2012 5:33 PM	Rate (0)
mohamedsamy Posts: 50 Rating: (2)	I am using a plc to multiply a real number then convert it to real the problem is that I can't propagate my number from a block to another one !!! the details are in the picture (btw i am using a data block) I assign values to the marker using the variable table Attachment help.zip (107 Downloads)
mohamedsamy Posts: 50 Rating: (2)
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9/19/2012 5:42 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	mohamedsamy I am using a plc to multiply a real number then convert it to real the problem is that I can't propagate my number from a block to another one !!! the details are in the picture (btw i am using a data block) I assign values to the marker using the variable table Hello, I suggest reading threads clustered here: Cases on BR-EN/ENO Mechanism For PLC to continue chain calculation,it should ensure correct result of previous functions.This is done by EN/ENO mechanism in LAD as you can see in your case. Possibly,There is a problem with Multiplying function which may come from invalid result or invalid real number in inputs. Update if it is not your case. Best regards Hamid hosseini
	Last edited by: hdhosseini at: 9/19/2012 5:53 PM //typo Demo Channel on Youtube
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9/19/2012 7:46 PM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 1/13/2026 Posts: 726 Rating: (71)	Hi, This happens because result of block MUL_R is outside floating point range. From Step 7 Help If the result is outside the permissible range for a floating-point number (overflow or underflow), the OV bit and OS bit will be "1" and ENO is logic "0", so that other functions after this math box which are connected by the ENO (cascade arrangement) are not executed. So the value in your case is 5.60159E-42 which is less the lowest range of 1.175 495E-38 and this ENO is ZERO and no further execution. Mentioned below is persmissible range -3.402 823E+38 to -1.175495E-38 and 0 and +1.175 495E-38 to +3.402 823E+38

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This contribution was helpful to 1 thankful Users dchartier