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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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Use fiber optic cables instead of copper conductors if you want your field bus to
cover greater distances regardless of the transmission rate and be insensitive to
external noise fields.
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For information on what to take into account relating to equipotential bonding when
you configure your network, refer to the corresponding chapter in the appendix.
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the section referring to communication in the relevant CPU manual.
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The MPI (Multipoint Interface) represents the CPU's interface for PG/OP
connections or for communication in an MPI subnet.
The typical (default) baud rate for all CPUs is 187.5 Kbps. You can also set the
rate to 19.2 Kbps for communication with an S7-200. Other baud rates are only
possible with CPU 317-2 DP (up to 12 Mbps).
The CPU broadcasts its bus parameter configuration via the MPI interface (e.g. the
transmission rate). This allows a PG, for example, to acquire the correct
parameters and automatically connect to an MPI subnet.
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In RUN mode you may only connect PGs to the MPI subnet.
Other stations (e.g.. OP, TP, ...) should not be connected to the MPI subnet while
the PLC is in run mode. Otherwise, transferred data might be corrupted as a result
interference or global data packages be lost.
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