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Sma Antenna Sockets; Frequency Bands And Signal Strength - Siemens SIMATIC LOGO! CMR2020 Operating Instructions Manual

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4.3

SMA antenna sockets

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.
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 Antenna and
cabling technology for LOGO! CMR (Page 137).
4.4

Frequency bands and signal strength

Frequency bands in Europe and other regions
Depending on the frequency bands your mobile wireless provider uses:
● Select the antenna suitable for your frequency band from the accessories (Page 137).
Signal strength
During installation make sure that there is a good signal strength:
● If the "R" LED is lit green or flashes green, the signal strength is very good.
● Lit yellow or flashing yellow signals medium quality.
● If the "R" LED is not lit, this indicates an inadequate signal strength, refer also to the
section LEDs to display operation (Page 19).
Large metallic objects in the vicinity of the antennas, for example reinforced concrete, impair
the signal strength.
LOGO! CMR2020 / LOGO! CMR2040
Operating Instructions, 09/2014, C79000-G8976-C356-01
WARNING
Installation, connecting up, commissioning
4.3 SMA antenna sockets
29

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Simatic logo! cmr2040

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