Problem with connection IM151-7 CPU with PC by MPI

aleks

Hi, people.
I have IM151-7 CPU and MPI adapter (6ES7 972-0CA21-0XA0).
I set in HW config MPI speed 1.5 Mbps and download to CPU.
After I lost connection wityh CPU.
How I can connect to my CPU?
Help, please.

Hello aleks,

Proceed as follows in order to reset a CPU to the delivery state via the mode selector switch:
1. Switch off the supply voltage.
2. Remove the SIMATIC Micro Memory Card from the CPU.
3. Hold the mode selector switch in the MRES setting and switch the supply voltage on
again.
4. Wait until LED lamp image 1 from the subsequent overview is displayed.
5. Release the mode selector switch, set it back to MRES within 3 seconds and hold it in
this position.
6. Wait until LED lamp image 2 from the next overview is displayed. This lamp image lights up for approximately five seconds, that is for the duration of RESET. During this period you can abort the resetting procedure by releasing the mode selector switch.
7. Wait until LED lamp image 3 from the subsequent overview is displayed and release the
mode selector switch again. The CPU is now reset to the delivery state. It starts without buffering (all LEDs are lit) and changes to the STOP mode

Hope this will helps.

Best regards,

Hristo Mihalev

aleks

Thank forrecommendations, I connected to CPU.
But when I insert MMC propperties of MPI changed again from MMC and I can't connect.
Maybe I need to reset MMC and insert it to CPU and after that change propperties MPI.

The MMCs of the S7-300 may be read or written only by the following devices outside the CPU:

• Field PG
• Power PG
• MMC programming adapter (MLFB 6ES7798-0BA00-0XA0) for use with PG 720 or PG 740
• USB prommer (MLFB 6ES7792-0AA00-0XA0).

UMENCHO

...
Yes, you need to reset MMC or change it with new one. Perhaps following FAQs will helps - How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs?