Communication / Networks
The communication between two S7-1200!
Thread Starter: freefly2009 Started: 12/27/2009 4:49 AM Replies: 1
12/27/2009, 4:49 AM
12/27/2009, 1:14 PM
Last visit: 10/31/2014
The CSM1277 Ethernet switch is just a simple unmanaged 4 port Ethernet switch, any other Ethernet switch (managed or unmanaged) can be used instead of it.
If you do not have a switch available you can also directly connect the two CPU's with an Ethernet cable (which can be a direct or crossover cable, the PN port of the S7-1200 does have the so called "Auto crossover" functionality inbuilt).
Bottom line, the the "missing" CSM1277 is not your problem, so its either your program/configuration or a faulty Ethernet cable (I don't yet have Step 7 Basic and can't unfortunately verify your program).
I suggest you first get your hands on any Ethernet switch you can find so you can link teh two CPU's ADN your programmig nlaptop together to be able to test your comms setup and logic (you are locking yourself out from this at the moment if you link the two CPU's directly with an Ethernet cable).
I hope this helps and good luck
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