CPT Prob

PLCgen · Oct 25, 2014

Placed the below expression in RSlogix500 and I get an error when compiling

( ( I:2.0 - 4000)/(20000 - 4000 ) * ( 200 - 0 )+ 0

the error:
Invalid expression! Two operands in sequence!

How do I resolve this ?I changed up some stuff included more brackets and still got an error of either too many parenthesis or not enough parenthesis

dmfrey · Oct 25, 2014

Use the pipe symbol ( | ) for your divide. It recognizes the slash as a data table address symbol.

PLCgen · Oct 25, 2014

ok thanks apparently I used a different approach and resolved the error

Mickey · Oct 25, 2014

Change the "divide" operand to a | (pipe) not the forward slash.

(((I:2.0-4000)|(20000-4000))*(200-0))+0

Edit: dmfrey types faster then I do.

PLCgen · Oct 25, 2014

thanks

OkiePC · Oct 25, 2014

Uh, you can simplify that a bit if those literal constants are truly literals...a few parenthesis will go away too:

(I:2.0-4000)|(20000-4000))*(200-0)
(I:2.0-4000)|(20000-4000)*200
(I:2.0-4000)|16000*200
(I:2.0-4000)|160*2

Put the original formula in a rung comment if you want to simplify the expression and maintain documentation of how you got there.

Paullys50 · Oct 25, 2014

PLCgen said:
Placed the below expression in RSlogix500 and I get an error when compiling

( ( I:2.0 - 4000)/(20000 - 4000 ) * ( 200 - 0 )+ 0

the error:
Invalid expression! Two operands in sequence!

Looks like you had an extra parenthesis in your equation that you didn't close?

( ( I:2.0 - 4000)/(20000 - 4000 ) * ( 200 - 0 )+ 0

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