Log file in PLC
 

Hi everybody, I will like to write a ladder that could save some values in a log file that could be easy to read in the event of trableshooting. Example: a sensor is working normal and suddenly fail, I want to save the value of the sensor failure in a log file that could tell me ,that this sensor needs to be replaced or adjusted.
My question is how to write a ladder to save the failure value of the sensor in a log file. Also how to write the log file using RSLogic500.
Thanks.

Well a little more info is needed. is the input analog or discrete?
What it senses is constant in time or a variable? The log file is easy but lets take care of the other items first.


Drewcrew6

Thanks for your answer.
The input is discret and the sensor is sensing a countinuous movement.
I am new PLC lerner and I will like any example how to do this Log file and rung.
Thanks again.

PLC memory is limited, and predetermined. In creating a log file, you need to decide, up front, how many log records you will be storing, and the amount and type of the data each "record" will contain.

Then the "value" is either One or Zero.

How are you determining that the sensor has "failed"?