How much is the voltage of the PLC battery to be replaced with a new one?

Lithium battery for PLC storage, the battery should be replaced when the voltage is lower than 3V.
When the PLC user program is to remain in the RAM, the battery is used. The battery is usually a 3V or 3.6V non-rechargeable lithium battery. The battery life is usually about five years. When the battery is used for a long time, the voltage will be Falling, when it falls below enough to guarantee data in RAM, the program in RAM is lost. If the user does not have a backup program, it will be quite troublesome.
The general PLC has a battery voltage detection circuit inside. When the voltage drops to a certain level, the PLC will alarm and remind the battery to be replaced. The PLC’s instruction manual provides a way to replace the battery. Generally speaking, after the PLC is powered off, because the RAM power supply terminal of the PLC is connected with a charging capacitor, even if the battery is removed, the charging power on the capacitor is sufficient for the data in the RAM to remain for a period of time, so if the battery is removed in a short time (usually 5 minutes) Then replace the new battery, the data will not be lost.
However, the environment in which the user actually uses the PLC is different, for example, the capacity of the capacitor is reduced, and the RAM power supply circuit has
Dust, sludge, etc. form a discharge circuit, which will speed up the discharge speed of the capacitor after the PLC is powered off, thus making the time difficult to grasp. If you replace the battery while charging, you can keep the program safe. Because the power will always
There is a voltage applied to the power supply pin of the RAM chip. Of course, you should also be careful when changing, pay attention to the polarity of the battery and avoid short circuit.
It is best to power on the PLC for 15 minutes (charge the internal capacitor), power off, change the new battery within 5 minutes, and then power on it.

Cheap Allen_Bradley 1747-BA/1769-BA-2pcs Battery Replace for Allen Bradley SLC500 CR14250SE

Cheap Getac BP-LP2900 Battery Replace for Getac RS2020 S400 V200 ME202EK ME202C 338911120104

Cheap Getac BP-LP2900/33-01PI Battery Replace for Getac LI202S DR202S RS2020 S400 V200 ME202C

Cheap Lenovo L11C4P32 Battery Replace for Lenovo 1ICP04/45/107-4

Christmas Sale Samsung EB-BR380FBE battery -1.14Wh

Samsung battery pack for Samsung Gear Fit2 Fit2 SM-R360

Samsung EB-BR382FBE compatible with Samsung 2017 Version EB-BR382FBE-Just Christmas Specials!

Lenovo – Christmas Cheap tablet battery Replacement for L13M2P22

Dell laptop battery pack for Dell Precision 15 (7510) / 17 (7710)