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Hi to everyone, I´m new here so if I´m doing something wrong please forgive me
I have a problem with my CPU 412 (Siemens). The problem is following:
Yesterday I was on project site and I saw the PLC. The problem that I saw is the folowing:
The CPU has one battery and the switch for the battery on the PLC is ON. I measured the voltage of the battery and it was 3,6 V, so that means that the battery is OK.
The next thing that I did was following:
I put out the flash memory card from the slot, and I shut down the main power and rise again. In this case the PLC (CPU) has a problem and couldn't start. When I shut down the power, the CPU didn't memorise the SW program, even though the battery is ON and OK. WHY this happened? I thought that when the power shuts down, battery helps the CPU to memorise the SW, and after when the power is ON again, the CPU start the SW without any problems, and without flash memory card.
Next step:
I put the flash memory card in the slot, and the procedure with the power, I did it again (Shut down, and start Up). With the flash memory card into the slot the CPU starts and there is no problems.
Can some one explane to me what is happening, please?
Thanks in advance
I have a problem with my CPU 412 (Siemens). The problem is following:
Yesterday I was on project site and I saw the PLC. The problem that I saw is the folowing:
The CPU has one battery and the switch for the battery on the PLC is ON. I measured the voltage of the battery and it was 3,6 V, so that means that the battery is OK.
The next thing that I did was following:
I put out the flash memory card from the slot, and I shut down the main power and rise again. In this case the PLC (CPU) has a problem and couldn't start. When I shut down the power, the CPU didn't memorise the SW program, even though the battery is ON and OK. WHY this happened? I thought that when the power shuts down, battery helps the CPU to memorise the SW, and after when the power is ON again, the CPU start the SW without any problems, and without flash memory card.
Next step:
I put the flash memory card in the slot, and the procedure with the power, I did it again (Shut down, and start Up). With the flash memory card into the slot the CPU starts and there is no problems.
Can some one explane to me what is happening, please?
Thanks in advance