I use the PV780. I need to execute something like "black box".
Engine Faults DM1 and additional errors that we get the CANopen - we need to save to a buffer in the form of:

1. time, date, error, description;
2. time, date, error, description;
3.
.
.
100.

This table should be show errors on one of the page PV780.
One key on PV780, should be able to send errors to usbstick.
If there are more than 100 errors are another error should override on items 1.
Can you help me to create something like this?

Creating a black box style logger is possible but not simple. If you only need to capture the data, then you can do this by using the standard logger application and setting a maximum size. This will keep the last X kb of data simulating what your describing.

However, displaying the data is not as easy. To do this you would have to create a set of variables and strings that you update from scripting after reading the file. Not trivial but doable. Our DM2's use a very similar method to display values (see the 780 Standard Config to see how they are displayed)