S7Guy
Member
I've got a problem with an S7-416 CPU. The last time it was used, the MPI port was defined as a profibus port. Nothing wrong with that. But now, I need to set the port back to MPI, but I can't get the master reset to work properly. What I want to do is set it back to the factory defaults, with the MPI port set to "2".
Here is a snippet from one of the S7-400 manuals. But, it isn't quite clear on steps 5-7 when or if I should release the toggle switch or how long I should expect to wait for each transition. I've tried every combination, and I get the MPI address set to 2, but only with the external fault blinking (should be solid) and no other lights on. As soon as I power off/power on again, it goes back to what it was, so evidently the master reset isn't completing.
If someone has an S7-400 they can test with, it would be great if you could verify the following precedure:
Proceed as follows to reset a CPU to its factory settings:
1. Switch off the mains voltage.
2. If a memory card is inserted in the CPU, always remove the memory card.
3. Hold the toggle switch in the MRES setting and switch the mains voltage on again.
4. Wait until LED pattern 1 from the following overview is displayed.
5. Release the toggle switch, set it back to MRES within 3 seconds and hold it in this
position.
After approx. 4 seconds all the LEDs light up.
6. Wait until LED pattern 2 from the following overview is displayed.
This LED pattern lights up for approximately 5 seconds. During this period you can abort
the resetting procedure by releasing the toggle switch.
7. Wait until LED pattern 3 from the following overview is displayed, and release the toggle
switch again.
The CPU is now reset to its factory settings. It starts without buffering and goes to STOP
mode. The event "Reset to factory setting" is entered in the diagnostic buffer.
Here is a snippet from one of the S7-400 manuals. But, it isn't quite clear on steps 5-7 when or if I should release the toggle switch or how long I should expect to wait for each transition. I've tried every combination, and I get the MPI address set to 2, but only with the external fault blinking (should be solid) and no other lights on. As soon as I power off/power on again, it goes back to what it was, so evidently the master reset isn't completing.
If someone has an S7-400 they can test with, it would be great if you could verify the following precedure:
Proceed as follows to reset a CPU to its factory settings:
1. Switch off the mains voltage.
2. If a memory card is inserted in the CPU, always remove the memory card.
3. Hold the toggle switch in the MRES setting and switch the mains voltage on again.
4. Wait until LED pattern 1 from the following overview is displayed.
5. Release the toggle switch, set it back to MRES within 3 seconds and hold it in this
position.
After approx. 4 seconds all the LEDs light up.
6. Wait until LED pattern 2 from the following overview is displayed.
This LED pattern lights up for approximately 5 seconds. During this period you can abort
the resetting procedure by releasing the toggle switch.
7. Wait until LED pattern 3 from the following overview is displayed, and release the toggle
switch again.
The CPU is now reset to its factory settings. It starts without buffering and goes to STOP
mode. The event "Reset to factory setting" is entered in the diagnostic buffer.