
Annex
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Mounting and installation, Technical Description, T 811 086 en e
12.1.5
Power supply for MMI-BUS
Notice
For MMI-BUS devices a minimum cross-section of 0.5 mm² (diameter 0.8 mm) is generally required for the
power supply line.
For starting up the MMI-BUS devices, a sufficiently high switch-on current must be available. For this reason, when dimen-
sioning the supply lines it is necessary to consider not only the power consumption of the devices but also the switch-on cur-
rent.
Power supply lines with 0.5 mm² (0.8 mm diameter)
max. 4 pcs. MMI-BUS devices
max. 400 m line length to the last device
max. one indication and control map
Power supply lines with 1.5 mm²
max. 8 pcs. MMI-BUS devices
max. 800 m line length to the last device
max. 3 indication and control maps
Power supply lines with 2.5 mm²
max. 8 pcs. MMI-BUS devices
max. 1,200 m line length to the last device
The following distance table applies to individual devices:
Designation
Max. line resistance
[Ohm]
Max. distance in metres
Cable
ø = 0.8 mm
A = 0.5 mm
2
Cable
A = 1.5 mm
2
Cable
A = 2.5 mm
2
B3-MMI-FAT, B5-MMI-FPS
B3-MMI-UIO ,B5-MMI-FIP
B5-MMI-FPD B5-MMI-IPS
94,5
1’200
1’200
1’200
B3-MMI-IPEL, B3-MMI-EAT
75,6
1‘058
1‘200
1‘200