Best programming practices

[T Gibbs]

When the timer rung goes false the timer resets

 

[padees]

What would be the purpose of this timer? If it rolls constantly, are you picking something up off of this?

 

[scameron81]

What would be the purpose of this timer? If it rolls constantly, are you picking something up off of this?

I use them to send a message every x seconds or for any timed cycle that constantly repeats. One example being an air dryer where it just repeats the same cycle over and over again.

 

[rollinstone]

Maybe use cyclic interrupt

 

[Jeebs]

When using analog input as feedback from drives, etc, please, please, pretty please do not use "<> 0" to check if the drive/etc is active.

I have seen this being done many times. I have never seen it work.

 

[Andybr]

When using analog input as feedback from drives, etc, please, please, pretty please do not use "<> 0" to check if the drive/etc is active.

I have seen this being done many times. I have never seen it work.

And never test for equality with floating point numbers. 0.0000000001 does not equal 0.

 

[mbartoli]

Also never make a change on a Friday...

And never force a bit to take care of something temporarily just before leaving to catch a plane OR on a Friday afternoon!

 

[Chris Hasler]

You will make a backup before modifying the code.

TIA Portal can and will brick the project file for stupid reasons

 

[Saturn_Europa1]

What would be the purpose of this timer? If it rolls constantly, are you picking something up off of this?

I am going to use it in conjunction with a manual switch and some compare functions to pulse a valve open and close.

i.e. 10 second timer. 3 seconds valve open. 7 seconds valve shut.

 

[padees]

My most favorite rung comment to date, which I just read today going thru a program.

"If the part is over 36" long, the Light Curtains are disabled".

Someones work around from a while back.

 

[ganutenator]

My most favorite rung comment to date, which I just read today going thru a program.

"If the part is over 36" long, the Light Curtains are disabled".

Someones work around from a while back.

Here's a guy looking for a safe word.

 

[padees]

Here's a guy looking for a safe word.

Company that originally built this rig bit the dust a long time ago, and no one is wise to this extended feature, until today!

 

[Jeebs]

You will make a backup before modifying the code.

TIA Portal can and will brick the project file for stupid reasons

Why didn't you include HWConfig?
I would've added HWConfig.
You should add HWConfig.
Why should you add HWConfig?

Cuz some ******* ********* ********* **** ********* ****** ***hole did a HWConfig download yesterday and didn't take a back-up.
Download bricked the PLC.
PLC does ... did ... handle an important part of our process.
Most recent back-up had ALL the wrong settings. Sanitary states, tank states, tank designations, recipe data, etc etc etc. All wrong. All wrong.