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I would like to use preferably use three Siemens HMI touch panel control and monitoring units located at three different places such as loading point, unloading point and one on main control panel. All three HMIs with one Siemens PLC. Kindly help me.

Hello Madan;

All of the recent Siemens S7 CPUs will support up to 3 "OP connections", one per HMI. This is independant of the protocol used to connect to the HMI, or the speed of the connection. It only depends on the resources of the CPU.

This Siemens support FAQ lists available OP connections for present CPUs, so you can evaluate yours:
http://support.automation.siemens.com/WW/view/en/299124
Title: "What is the maximum number of OPs that a CPU S7-300 can communicate with?"

Hope this helps,
Daniel Chartier

Hi,

What help do you need? You can run multiple TP177micros with an s7-200 on the same network. The s7-200 manual is an excellent source of information, available on the Siemens website http://www.siemens.com/s7-200.

Marc

http://s7-200.germainesystems.eu