Posted 20 Feb 2020 hi everyone, ive recently started working at a company who uses omron PLC's im a bit more familiar with siemens i used in university. one of my first tasks at work was to go through the current plc programs we have installed, ive noticed going through them that the previous engineer doesnt use the whole resolution of the analog input, i was wandering if this was some sort of practice im not familiar with or if they just have done it their own way. for example the ad041 expansion unit has a resolution of 1/6000, which would be scale of 0-1770 in hex, however in the programs im looking through this top end hex value is always listed as 1700. im assuming there some safety precaution or something that i don't know about, thanks for any answers in advance * the image is of the data points being put into the SCL function Share this post Link to post Share on other sites
Posted 20 Feb 2020 Part number of the expansion unit? Share this post Link to post Share on other sites
Posted 20 Feb 2020 ad041 analog input unit, attatched to a cp1l -m40 plc Share this post Link to post Share on other sites
Posted 20 Feb 2020 I can understand your question. At 1700h you are at 98% of resolution. If you change this, it may affect other parts of the program. Just make sure you understand everything that will be affected. gtsuport Share this post Link to post Share on other sites
Posted 20 Feb 2020 I don't see any reason for it from the Omron side. It's possible it's specific to the connected device or they were calibrated as such. The scaling is straight forward and the CP1W-AD041 has over and under detection. Share this post Link to post Share on other sites
Posted 20 Feb 2020 Also, looking at the values in the SCL instruction, your MAX scaled value is #64. Not sure changing the #1700 to #1770 will make any difference. And as IO Rack has said, it may be tied to the calibration of the input device. Share this post Link to post Share on other sites
Posted 20 Feb 2020 (edited) i agree it wouldn't really make a difference, i guess it was either calibration or a mistake otherwise i dunno, thanks anyways Edited 20 Feb 2020 by Bobodopalus Share this post Link to post Share on other sites