Siemens PLC battery replacement method

When the PLC user program to be retained in RAM Battery will be used ,Batteries typically 3V or 3.6V non-rechargeable lithium batteries,Battery life is usually about five years ,Battery with a long ,Voltage will drop,When it fell to the data is insufficient to guarantee the RAM ,The program RAM is lost . If the user does not have a backup program ,Will be quite troublesome.
         General Internal PLC has a battery voltage detection circuit ,
When the voltage drops to a certain extent , PLC will alarm ,
Reminder to replace the batteries. PLC to the operating instructions are provided to replace the batteries.In general, the PLC in power,Because the PLC RAM capacitor charging power terminations ,Even if the battery was removed , enough electricity to charge the capacitor RAM data within a period of time , so after a short time if the battery removed (usually five minutes ) and then go put a new battery , the data is not lost .
However, the actual use of PLC different environmental conditions , such as capacitance decreased capacity , RAM power circuit dust , such as the formation of sludge discharge circuit , etc., which will speed up the PLC power capacitor discharge rate , so that the time is not good grasp. If you replace the battery can be foolproof security procedures in the case of live . Because there will always be supply voltage is applied to the RAM chip’s power pin . Of course, also be careful when replacing the response, note the polarity of the battery and to avoid a short circuit occurs .
It is best to PLC power for 15 minutes ( the internal capacitor charging ),power , for good within five minutes a new battery , then power to try ,
           Siemens PLC have with the card , there is without a battery ; also with a card with the battery. MMC card program exists , if there is no memory card , you need a battery to save the program, replace the battery time is important to note , in the case charged , take out the old battery , then you can put the new battery .

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