plc programing help

robertbennet · Apr 20, 2014

Hello iam trying to write a program for my web control that does the following

if temp sensor 4 is lower than 40 input 2 will come on and when sensor 4reaches 60 i want input 2 off
then if temp sensor 4 reaches 85 then output 3 turns on and when sensor 4 reaches 78 input 3 is off

any examples :

rossw · Apr 20, 2014

robertbennet said:
Hello iam trying to write a program for my web control that does the following

if temp sensor 4 is lower than 40 input 2 will come on and when sensor 4reaches 60 i want input 2 off
then if temp sensor 4 reaches 85 then output 3 turns on and when sensor 4 reaches 78 input 3 is off

That only makes sense if you mean OUTPUT 2 and 3, not input?

Something like this should do it.

Code:

start
  tstlt T4 400
  set op2 1   ; output 2 on if T4<40.0
 
  tstge T4 600
  set op2 0   ; output 2 off when T4>=60.0
 
  tstge T4 850
  set op3 1  ; output 3 on when T4>=85.0
 
  tstle T4 780
  set op3 0  ; output 3 off when T4<= 78.0
 
end

plc programing help

robertbennet

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rossw

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