Connecting The Antenna - Siemens LOGO! CMR2040 Operating Instructions Manual

3.3.3

Connecting the antenna

Risk of lightning strikes when installed outdoors
If you install an antenna outside, you need to ground the antenna to protect it from lightning
strikes. This work must only be carried out by qualified personnel.
NOTICE
Damage to devices due to incorrect accessories
Select the antenna suitable for your frequency band from the accessories. Other antennas
could interfere with product characteristics or lead to defects.
Note
Maximum length of the antenna cable
The maximum permitted length of the antenna cable is 15 m.
The CMR has two antenna sockets of the type SMA for connecting the antennas. The
antennas must have an impedance of approx. 50 Ω.
Follow the operating instructions of the antennas used. See also section Antennas
(Page 155).
You will find configuration images with antenna cables for different structures in the section
Antenna cable (Page 157).
Frequency bands in Europe and other regions
Select the antenna suitable for your frequency band. See section Antennas (Page 155).
You will find the frequency bands supported by the CMR in the section Technical
specifications (Page 141).
Signal strength
During installation make sure that there is a good signal strength: You will find the meaning
of the statuses of the "R" LED in the section LEDs to display operation (Page 30).
If the LED is lit green, the signal strength is very good. Lit yellow signals medium quality.
Large metallic objects in the vicinity of the antennas, for example reinforced concrete, impair
the signal strength.
LOGO! CMR2020, LOGO! CMR2040
Operating Instructions, 10/2016, C79000-G8976-C356-03
WARNING
Installation, connecting up, commissioning
3.3 Connecting up the device
41