Technical data

R911305038 / 01 | Rexroth VCP-Operating Concept Electric Drives and Controls | Bosch Rexroth AG 6-107
INTERBUS MMICOM raw
6.8 INTERBUS MMICOM raw
6.8.1 Integration of the Operating Devices
INTERBUS is an open field bus concept that is supported by a number
of manufacturers of sensor technology and actuator devices. This
means that, in addition to using the same bus to connect to the opera-
ting devices, several other participants can be connected to the cont-
roller (for example, decentralized inputs and outputs).
The operating device is integrated as a slave in the 2-wire remote bus.
In this context, the operating device occupies a data width of 4 words
or 8 bytes on the INTERBUS. The controller maps each operating
device with 8 bytes IN data and 8 bytes OUT data in the memory map.
If the Physical Addressing operating mode is selected in the controller
board, the participants’ input and output areas are placed sequentially
in the memory of the controller in the same order that they are physi-
cally installed in the bus.
If the Logical Address operating mode is selected in the controller
board, the location of the input and output areas can be placed freely in
the controller memory. The location of these areas is also independent
of the sequence of bus participants.
6.8.2 MMICOM Profile
The MMICOM profile distinguishes between the following three basic
data channels on the INTERBUS:
1. Direct process data channel
2. Indirect process data channel
3. Parameter channel.
6.8.2.1 Direct Process Data Channel
Direct process data is cyclical data that remains constant while the
device is in operation. They are not acknowledged and are incorpora-
ted cyclically into the process data channel (for example, 16 inputs of
an input module or bit information of a key field - device class A1 or
B1).
6.8.2.2 Indirect Process Data Channel
Indirect process data is data that does not remain constant while the
device is in operation, and changes depending on external events or
requirements. Process data identifiers (PD index) are used to deter-
mine the structure of this data. The handshake between both commu-
nication partners is defined using a status/control byte.