Hi im currently devloping the cfP 2120 with 2 relay cards a AIO card and a thermo couple card, and it will be running for long periods of time logging data and using th clock to time stamp the files, In a standalone fasion
In the event of a power out will the cfp2120 keep the time?
IT will not always be conencted to a ethernet. so i wondered if there is a small litum battery backup for the RTC inside it
yes there's is a single 3V lithium battery inside the cFP 2120.
Usually you'd hook up to a time server to handle for any time slipages, or just to make sure that all the units on the network are working from the same timestamp, but if you don't want this, then set the time-server to 0.0.0.0. (You can use this to prove whether the battery is keeping the time by setting it to 0.0.0.0, then run some code to write a file (it will be timestamped, or but the current time into the text of the file) and then switch it off for a couple of minutes. On power up, check the time again.)