S7-1212, Memory card evaluation error

Try while the PLC is powered off to remove the MMC from the PLC.  Now go online with the PLC. Is your program still there?  If so, you may have the restart setting to not restart PLC solving logic (running the programming) on power up. 

If your PLC program is lost, it has been transferred to your MMC.  Download the programming again.  Is there a reason you have the memory card installed?  It is not really necessary in many cases.

deepsr

Hello,

I am working with a 1212C AC/DC/Rly 

6ES7 212-1BE40-0XB0

Firmware V 4. 1

TIA V 13.0 SP1.

The PLC was working fine for a two weeks,

Then I unplugged it and plugged it after a week or so and now the PLC is not working.

The LED light is blinking red next to error option.

When I try to reset the memory card by running online diagonistic,I get the following error in the diagnostic buffer.

-Memory card evaluation error.(I have attached the error message).

Any ideas where and what the problem is ?Is the memory card corrupted?

The PLC programming is not stored in the memory card btw, I use the memory card for datalogging

In the hardware configuration of the PLC in your project (double click your PLC in the project tree, double click the Device configuration option).

In the lower pane of the system (V13) are various settings of the PLC.

Find the Startup settings in the General Tab.  Click in and look in the right pane within that section.

Startup after POWER ON options.

I *always* choose Warm restart - RUN.   I have yet to come up with a reason to select anything else, though I'm sure there are reasons for safety, liability and such that this is not the default action.

deepsr

Hello Huggy_d1,

How do I change the restart settings to 'not restart PLC solving logic on power up'?.

The problem is how the PLC sets the flag at power off.  While I understand your confusion and I felt the same way before defaulting to "warm restart RUN" on every project I deploy, I think (*do not know*) the PLC senses a power off condition, it saves the system state -- which, when it saves that state, the plc is stopped because it has lost power -- so it saves the stopped state.

Again, this is just me putting words to a situation that describes how it behaves, not how it is supposed to work according to the names.

In other words, I agree it makes no sense. :(

deepsr

Hello,

The CPU configuration was set to WARM restart-Mode before power off. It was set by default , now I changed it to RUN and it works.

What I do not understand is, when the setting is WARM restart- mode before power off, the CPU will start on the mode which it was previously running before disconnecting the power (In my case the PLC was running alright before I disconnected the power ,so the CPU should automatically start in RUN mode).

Is this a common type of error, does it happen frequently?