Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: Garyhlucas on June 27, 2018, 07:23:29 PM

Title: Using BRX SD card
Post by: Garyhlucas on June 27, 2018, 07:23:29 PM

We want to back up the PLC program to the SD card. I believe that has said to be possible.  However it occurred to me that saving all set points to the SD card would be very nice too. A fresh PLC program load is nice, but re-entering hundreds of set-points is not so much fun.  It could be really bad if some them got missed too. 

Anyone suggest a good way to do this?

Title: Re: Using BRX SD card
Post by: franji1 on June 27, 2018, 08:06:56 PM

If your "set points" are a part of your "retentive data", that can be done via the BACKUP instruction to the SD card.

Note that the full retentive data set can NOT be a "snapshot" at a specific instance in time since it takes MULTIPLE PLC scans to backup all that data to the SD card.  Hence, the full set of backed up values will probably not represent a consistent "state".

But if the subset of your retentive data that represents what you call "set points" are NOT changing when you are performing the BACKUP instruction, you basically WILL have a "snapshot" of your "set points".

There is an option in the Additional Content group in the BACKUP instruction to Include Retentive Memory Values.  Just check that.