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We are currently using a Simatic TI 555 PLC with integral ProfiBus DP port. All the I/O we are using are those ET200M ProfiBus I/O connecting to that DP port. We now want to have some HMI panel connect to the system all around the workshop. Can anybody tell whether it is ok to mix those HMI with those I/O using the same DP port/cable? If it is ok, any software necessary? (The Siemens catalog are so confusing that we cannot arrive at a conclusion.)