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Found 6 results

1. ## Control Logix CPT Statement Oddity

Ran into this unique little "bug" today. Tag Variable is INT , Tag Output is REAL  Using CPT Instruction  (Variable / 2000) * 700 results in an output of Zero (0.0). Using CPT Instruction (700.0/2000.0)*Variable results in a non-zero Real Number (350.0 for example if Variable = 1000) Turns out reading the help, that CPT does math in the type of the first variable encountered and then converts to the destination type. Thus 1000/2000 in Integer Math = 0 and 0 times 700 equals 0 which converts to 0.0 Sharing just cause I'd never hit this "bug" before.
2. ## Convert time

Hello. this is my firs post is possible to convert the elapsed time of timer to real or int i need to make some math operation with the elapsed time thanks
3. ## Logix 500 math instruction with Decimal Point

Hi my problem may have a simple solution but i cant work it out. I need to use the Divide function but it wont let me use a decimal point in either Source A or Source B. Is there a way to use a decimal point in Logix 500 Math instructions? Im using an AB Micrologix 1400 PLC. Can you only use math instructions with whole numbers? is there a way around this? Thanks James
4. ## Logix 500 math instruction with Decimal Point

Hi my problem may have a simple solution but i cant work it out. I need to use the Divide function but it wont let me use a decimal point in either Source A or Source B. Is there a way to use a decimal point in Logix 500 Math instructions? Im using an AB Micrologix 1400 PLC. Can you only use math instructions with whole numbers? is there a way around this? Thanks James
5. ## Need Help "No CPT" instruction available

Can't seem to figure out best way to do this. I take a simple reading of analog input and store value in N7:0 (This value will be between 0-1023) Two minutes later I take another reading and if the value has changed up or down by 7.5% I want to call subroutine. I have subroutine finished and working. What would be the best way to get this done, I can't seem to figure out the solution, the "CPT" function is NOT available to me, I am using the micrologix 1100, rslogix500. Thanks
6. ## Turning inches traveled per pulse (a real number) to inches per minute

I am currently trying to get my program to take distance traveled per pulse, which is based off of the diameter, and convert it into IPM. I am using RS Logic 5000 software. If anyone could help me get over this hump I would really appreciate it!