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I have a problem with a Cinterion GSM modem connected to an S7 1200 PLC for monitoring some telephone devices, the problem is this, sometimes small power outages have occurred that have turned the modem off and on again but not the PLC, consequently the modem has lost the settings it received when it was turned on from the PLC.
There is a way to parameterize the modem so that when it is powered up again after a power failure it keeps the configuration parameters it was set with, without being sent parameter strings again to continue doing the work it did before the power outage?
I tried to use the AT&W command without success because in any case to reset the modem you have to recall the parameters stored in the rom using the ATZ command.
The AT&W command saves the configuration parameters in the non-volatile memory and these parameters are reloaded on power up exactly like the ATZ command does. If you look at the modem AT commands manual read. AT&W stores the currently set parameters to a user defined profile in the non-volatile memory. The user defined profile will be restored automatically after power-up. So if you do not think that there are other parameters that are not saved by the AT&W command, for example those relating to the AT + IPR or AT + ICF commands (Topic) or you simply do not have the baudrate fixed and therefore the modem wants to receive at least one AT to auto-set the communication mode. In this case, the AT + IPR or AT + ICF commands can help. Last hypothesis is that the voltage micro-interruption does not allow the modem to completely self-reset and goes into a state of malfunction. If you have made the program on the PLC you can turn it off and on with a logic output just like we manage with the modem management function block on our systems SlimLine.
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