Hi everybody,

Look this new FAQ. I think is very important to know the rules when we work with connections.

Communication partners of S7-1200
The S7-1200 PLC communicates with the following devices via the PN connection:

• Other S7 CPUs (S7-200, S7-300, S7-400, S7-1200)
• STEP 7 Basic programming devices
• Basic panels
• Devices that use the TCP communication protocol or ISOonTCP

Maximum number of connections for the PROFINET port
The PROFINET port on the CPU supports the following simultaneous communication connections:

• 3 connections for HMI to CPU communication*
• 1 connection for programming device (PG) to CPU communication
• 8 connections for S7-1200 program communication using the T-block instructions (TSEND_C, TRCV_C, TCON, TDISCON, TSEND, TRCV)**
• 3 connections for a passive S7-1200 CPU communicating with an active S7 CPU:
  • The active S7 CPU uses GET and PUT instructions (S7-300 and S7-400) or ETHx_XFER instructions (S7-200).
  • An active S7-1200 communication connection is only possible with the T-block instructions.

*Important: These3 connections is the maximum number in same time, I mean, we can make a lot connections but respecting3in same time!

**Important: These 8 connections is the maximum number in same time, I mean, we can make a lot connections but respecting 8in same time!

http://support.automation.siemens.com/WW/view/en/38051505

Tzole1974

Hello,

Information was very interested!!.
But I can not open the Link to the information. I have registered but when i click on the URL,
a screen opened and informed me that i do not have access.

Can you please advise ?

Thank you.