Technical data

6-108 Bosch Rexroth AG | Electric Drives and Controls Rexroth VCP-Operating Concept | R911305038 / 01
INTERBUS MMICOM raw
6.8.2.3 Parameter Channel
In addition to the process data channel, the parameter channel allows
an FMS-like background communication to be carried out. In this con-
text, the bytes of a saved log are sequentially transferred via the
INTERBUS. This process is usually advantageous for slower commu-
nication processes where larger data volumes are being used, and it
does not delay the equidistant transfer of time-critical data.
6.8.3 Connecting the Operating Device
In the INTERBUS, the operating device is run in the indirect process
data channel. Neither the parameter channel nor the direct process
data channel is used. The user data is interpreted in accordance with
the MMICOM profile.
The connection to the bus is implemented using dc-decoupled RS485
drivers. The actual bus protocol is handled by the INTERBUS protocol
chip.
On the controller side, a manufacturer-specific INTERBUS master con-
troller board is required, preferably with dc-decoupling.
If the controller board in the controller has an 8-wire remote bus inter-
face (25 pin), use the bus terminal IBS 24 BK/LC2 to convert to the 2-
wire remote bus (9 pin).
Both the INTERBUS connection and the MMICOM protocol are inde-
pendent of the controller. As a result, only variable numbers and no
real controller addresses are transferred in the MMICOM protocol. The
variable number is referenced to the variable in the controller.
A function block must be called in the controller’s main program. This
function block is assigned the parameters for the location of the IN and
OUT data, and must be called for each connected operating device. If
necessary, the function block interpretes the requests received from
the operating device. In this context, either a read or a write function is
carried out, which makes the assignment between the variable number
and the actual controller variable. If necessary, the data is copied in the
controller in an event-controlled manner. As a result, the controller has
a say in what data is written and read by the operating device.
All services (requests) required to run the operating device originate in
the operating device. The operating device has client functionality. The
controller only reacts to the requests of the operating device, and
therefore fulfils the functions of a server.