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Old July 8th, 2008, 09:09 AM   #1
United States

Cryogen is offline
Join Date: Oct 2005
Location: NH
Posts: 151
Tech MPI network - how to connect PLCs, HMI

I have two S7-200 PLCs (CPU 224) connected to a HMI (mobile panel). Together they form a MPI network that is connected through RS-485 connectors and Profibus cable. My question is: How do I connect the cable and the connectors?

Is it this way?
Mobile panel (Terminaltion ON) ==> In of PLC-1, Out of PLC-1 ==> In of PLC-2 (Termination ON)
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Old July 8th, 2008, 10:09 AM   #2

dchartier is offline
Join Date: May 2003
Posts: 1,539
Hello cryogen;
Looks good, basically: termination only at both ends is the working principle.
Just take care of distances; MPI ports are non-isolated, so the maimum distance you can cover is 50m from end to end (without repeater).
Hope this helps,
Daniel Chartier
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