
MMI-BUS devices
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Mounting and installation, Technical Description, T 811 086 en e
7.3
Connection of MMI-BUS participants
The data line and the power supply are redundantly implemented. The power supply lines are laid out parallel to the data
lines. Power can be supplied from the control panel or from an external energy supply source.
7.3.1
Jumper assignment for MMI-BUS termination
The B6-BCB main control units and all MMI-BUS devices have two jumpers for terminating the MMI-BUS (jumper connected
= BUS terminated; jumper not connected = BUS open).
The MMI-BUS may be operated at normal speed (38.4 kBd) without BUS termination. On MMI-BUS devices with high data
speeds (96 kBd), it is
IMPERATIVE
that the beginning of the BUS (main control unit) and the end of it (last participant of the
MMI-BUS) are terminated with parallel resistance integrated on the printed circuit board.
7.3.2
MMI-BUS connection open
GndExt1
VExt1
GndExt2
VExt2
GndExt3
VExt3
GndExt4
VExt4
GndExt5
VExt5
B6-PSU
X5
1
2
3
4
5
6
7
8
9
B6-BCB
MMI-BUS
X6
MMI BUS participant
1
MMI +24VB
MMI +24VA
MMI +24VB
MMI +24VA
MMI GNDB
MMI GNDA
MMI GNDB
MMI GNDA
MMI-BUS data line B
MMI-BUS data line B
Power supply B
Power supply B
Power supply A
MMI-BUS data line A
MMI-BUS data line A
1
MMIBUSA-
MMIBUSB-
MMIBUSA-
BUSGNDA
BUSGNDB
BUSGNDA
BUSGNDB
MMIBUSB-
MMI BUS participant
1
MMIBUSA-
MMIBUSB-
MMIBUSA-
BUSGNDA
BUSGNDB
BUSGNDA
BUSGNDB
MMIBUSB-
1
MMI +24VB
MMI +24VA
MMI +24VB
MMI +24VA
MMI GNDB
MMI GNDA
MMI GNDB
MMI GNDA
Power supply A
Fig. 83 MMI-BUS connection open
Warning
If MMI participants up to version -E are connected to a B6-BCB main control unit, the jumpers must
NOT
be
connected!
The open connection is not recommended for new projects!