X20 system modules • Analog output modules • X20AO2438
X20 system User's Manual 3.10
407
4.4.3.9.2 HART communication standard
This module supports the HART communication standard for data transfer, parameter configuration and diagnos-
tics. The HART standard is used for the current range 4 to 20 mA. Be aware that the load is not permitted to fall
below 230 Ω .
Current [mA]
2
0
4
6
8
10
12
14
16
18
20
22
24
0
100
200
300
400
500
600
Lo
ad
[Ω
]
Prohibited
Range
Specified
HART operational range
Figure 169: Specified HART operational range
Both current ranges 0 to 20 mA and 0 to 24 mA are supported by this module. HART communication can also be
used in these ranges as well. It is important to make sure, however, that the output current lies within the specified
HART operational range.
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