Connecting up
5.3 Antennas
SCALANCE MUM856-1
Operating Instructions, 08/2021, C79000-G8976-C628-02
47
5.3
Antennas
The SCALANCE MUM856-1 has 4 antenna ports of the type N-Connect female. The antenna
used should have an impedance of about 50 ohms.
Note
Use the antennas from the range of accessories for the M87x device. You will find more
detailed information in "Accessories (Page 22)". If you use a different antenna, there is no
guarantee that the device will function according to the specification.
CAUTION
Minimum clearance to the device
The device may only be operated when the distance between the device (or antenna) and
user is at least 20 cm.
Notes on lightning protection
WARNING
Danger due to lightning strikes
Antennas installed outdoors must be within the area covered by a lightning protection
system. Make sure that all conductive systems entering from outdoors can be protected by a
lightning protection potential equalization system.
When implementing your lightning protection concept, make sure you adhere to the
requirements of the VDE 0182 or IEC 62305 standard.
Suitable lightning protectors are available in the range of accessories of SIMATIC NET
Industrial WLAN:
•
Lightning protector LP798-1N (order no. 6GK5798-2LP00-2AA6)
•
Lightning protector LP798-2N (order no. 6GK5798-2LP10-2AA6)
Note
We recommend that you use the maintenance-free lightning protector LP798-2N.
Exception:
When there is also DC power supplied via the antenna cable. In this case, only the
lightning protector LP798-1N can be used.
•
Depending on the plug, an adapter cable is required to connect to SMA.
