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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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SIMATIC offers the following subnets, according to different automation levels
(process, cell, field and actuator/sensor level ):
• Multi-Point Interface (MPI)
• PROFIBUS
• Point-to-point communication (PtP)
• Industrial Ethernet
• Actuator/Sensor Interface (ASI)
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MPI is a small subnet with just a few nodes at the field/cell level. It is a multipoint-
capable interface in SIMATIC S7/M7 and C7, intended for operation as PG
interface for networking just a few CPUs or for exchanging small volumes of data
with PGs.
MPI always retains the last configuration of the transmission rate, node number
and highest MPI address, even after memory reset, voltage failure or deletion of
the CPU parameter configuration.
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PROFIBUS in the SIMATIC open, multivendor communication system represents
the network at the cell and field level.
PROFIBUS is available in two versions:
1. PROFIBUS DP field bus for fast cyclic data exchange, and PROFIBUS-PA for
the intrinsically safe area.
2. The cell level as PROFIBUS (FDL or PROFIBUS-FMS) for fast data exchange
with communication partners equipped with equal rights.
However, you can also implement PROFIBUS DP and PROFIBUS-FMS with
communication processors (CP).
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