Siemens SIMATIC ET 200AL, System Manual

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Glossary
PROFINET with STEP 7
320
Function Manual, 05/2021, A5E03444486-AL
Micro Memory Card (MMC)
Micro Memory Cards are memory media for CPUs and CPs. Their only difference to the
SIMATIC memory card is the smaller size. S7-1500 and ET 200SP-CPUs use
SIMATIC memory cards.
MPI
The multipoint interface ( M ulti P oint I nterface,MPI) represents the programming device
interface of SIMATIC S7. It enables multiple devices (programming devices, text-based
displays, OPs) to be operated simultaneously by one or more CPUs. Each device is identified
by its unique (MPI) address.
MRP
MRP ( M edia R edundancy P rotocol) describes the ring redundancy according to IEC 61158 and
IEC 62439.
MRP interconnection
The MRP interconnection procedure is an extension of MRP. MRP interconnection enables the
redundant coupling of two or more rings with MRP in PROFINET networks.
MRPD
MRPD ( M edia R edundancy with P lanned D uplication of Frames) based on IRT and MRP. To
realize media redundancy with short update times, the PROFINET devices participating in the
ring send their data in both directions. The devices receive this data at both ring ports so that
there is no reconfiguration time.
Network
A network consists of one or more interconnected subnets with any number of devices.
Several networks can exist alongside each other.
OB
→ Organization block
OPC
OPC (OLE for Process Control) refers to a standard interface for communication in automation
technology.