Ambient condi‐
tions
Permitted range Remarks
CFU DIQ in
housing, also SI‐
MATIC CFU
DIQ in aluminum
housing
From -40 °C to 60 °C Mounting requirement Ambient temperature of
the CFU
Permissible load
current
Horizontal installation > 50 °C to <= 60 °C
1)
Max. 4 A
- 40 °C to <= 50 °C
1)
Max. 5 A
Vertical installation;
Slot X13 must be at the top
- 40 °C to <= 50 °C
1)
Max. 5 A
Air pressure
● From 1080 hPa
(corresponds to a
depth of
approximately
-1000 m)
● Up to 606 hPa
(corresponds to a
height of
approximately
4000 m)
The density of air decreases with increasing altitude. The cooling effect of air in
accordance with the elevation is shown in the following table
on derating.
1)
Relative humidi‐
ty
From 10 to 95%
Max. 95% at +25 °C
No condensation, corresponds to relative humidity (RH) exposure level 2 ac‐
cording to IEC 61131 Part 2
Contaminant
concentration
● SO
2
: <0.5 ppm
● RH: <60%, no
condensation
● H
2
S: <0.1 ppm
● RH: <60%, no
condensation
Test: 10 ppm; 4 days
Test: 1 ppm; 4 days
ISA-S71.04
severity level G1; G2;
G3
1)
Observe the information on installation in a housing and the following table on derating. Use in Ex Zone 2/22 only permitted
at elevations up to 2000 m.
Derating
The cooling effect of air is reduced at higher altitudes due to lower density.
The table shows the derating factor for the maximum permissible ambient temperature as a
function of device use at an altitude above sea level.
Table 12-15 Derating when devices are used at an altitude above sea level
Altitude above sea level Derating factor for ambient temperature
1)
(-1000 m) to 2000 m 1.0
3000 m 0.9
4000 m 0.8
1)
Maximum permissible ambient temperature in °C for 2000 m
Technical specifications
12.1 General technical specifications
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD 163
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