Mounting
4.3 Use at altitudes over 2,000 m
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
24
Operating Instructions, 04/2020, C79000-G8976-C512-03
Fastener for cable ties
All communication modules have integrated fastening points for cable ties. The fastening
points are located at all four corners of the modules.
The following figure shows the upper left fastening point for 2.5 mm wide cable ties.
Figure 4-2
Fastening the RF18xC/RF18xCI communication module with cable ties
4.3
Use at altitudes over 2,000 m
The RF18xC/RF18xCI communication modules can be used at altitudes > 2,000 m. See the
following information and restrictions in this regard.
Restrictions of the maximum specified ambient temperature
Table 4- 2
Restrictions of the maximum specified ambient temperature with regard to the altitude
Altitude
Derating factor
Max. permissible ambient tem-
perature
-1000 ... 2000 m
1.0
55
℃
2000 ... 3000 m
0.9
49 °C
3000 ... 4000 m
0.8
44 °C
4000 ... 5000 m
0.7
38 °C
The standard IEC 61131-2:2017 forms the basis for the derating factor and the calculated
maximum permissible ambient temperature.
A linear interpolation between altitudes is permissible. The derating factors compensate for
the reduced cooling effect of air at higher altitudes due to the reduced density.
Note
Suitability of the power supply
Make sure that the power supply units you use are also suitable for altitudes > 2,000 m.