Siemens LOGO! CMK2000 - Connecting the KNX Bus

Connection
6.5 Connecting the KNX bus
CMK2000
Operating Instructions, 11/2015, A5E34877550B/001
35
NOTICE
Do not violate the minimum bending radius limit of the Ethernet cable, otherwise this will
result in attenuation of the shielding effect. Furthermore there is a danger that the cable
shield will break.
Note
We recommend using RJ45 connectors from the Siemens FastConnect system as the plug
-
in connectors for the Ethernet cabling.
6.5
Connecting the KNX bus
The CMK2000 is connected to the KNX bus using the red/black KNX terminal.
① Red terminal (+), red cable
② Black terminal (-), black cable
Recommended bus cables:
• YCYM (2 x 2 x 0.8 mm
2
)
• J-Y(ST)Y (2 x 2 x 0.8 mm
2
)
• JH(St)H (2 x 2 x 0.8 mm
2
)
• A-2Y(L)2Y or A-2YF(L)2Y
Stripping length: 5 mm
Note
•
Only the red-black core pair is used; the white-yellow core pair is not connected.
•
Do not connect the shield of the KNX cable.
NOTICE
Do not use electrically conductive objects such as screwdrivers to lever out the KNX
terminal. Otherwise there is a danger that the two KNX pins may short-circuit and thus
destroy the KNX bus.