Parameter
Meaning
Example
Default
Unit of the tertiary varia‐
ble
Unit of the third variable
V
V
Quaternary variable
Fourth variable
Estimated lifetime
Normalized consumed
energy
Unit of the quaternary
variable
Unit of the fourth variable
d
Ah
9.6
Configuration of 4 to 20 mA communication
A field device with 4 to 20 mA communication can be connected to an adapter. The 4 to 20 mA
signal can be adapted and, when necessary, linearized. In addition to this, limit values can be
entered that specify the proportional value range and the alarm signals. If the entered values
are undershot or overshot, a warning or an alarm signal is sent by the WirelessHART adapter.
The following list contains information about the structure of these input boxes and the format
in which you can enter information in these boxes:
Parameter
Meaning
Example
Default
Transfer function
The linearization table can be enabled and dis‐
abled.
● On: the linearization table is enabled, the X
and X values of the characteristic curve are
disabled.
● Off: the linearization table is disabled, the X
and X values of the characteristic curve are
enabled.
Linear
Linear
End value
Upper range end value of the input current that
corresponds to the 20 mA value.
100 °C
20 mA
Start value
Lower range end value of the input current that
corresponds to the 4 mA value.
-20 °C
4 mA
Damping
Damping factor of the input current (0 ... 255 s).
● Currently disabled
0
0
Upper fault current val‐
ue
An error is signaled if this value is exceeded.
22 mA
22 mA
Upper limit of propor‐
tional range
An warning is output if this value is exceeded. 20.5 mA
20.5 mA
Lower limit of propor‐
tional range
An warning is output if this value is undershot. 3.8 mA
3.8 mA
Lower fault current val‐
ue
An error is signaled if this value is undershot.
3.6 mA
3.6 mA
Trim Loop Current Zero Pressing this button calls a method for trimming
the 4 mA value.
● To do this, you simulate 4 mA on the con‐
nected field device or set a current of 4 mA
in a different way. You will find the functions
in the menu.
Parameter assignment/addressing
9.6 Configuration of 4 to 20 mA communication
WirelessHART Adapter SITRANS AW200
Operating Instructions, 02/2020, A5E02777161-AA
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