X20 system modules • Analog output modules • X20AO2438
X20 system User's Manual 3.10
419
PvInput
Name:
PvInput_01 to PvInput_15
These registers return the current value of the process variable that has been read.
Information:
These registers are of data type REAL, which means that the available bytes on the X2X link are filled
more quickly when operated cyclically. If information from several slave nodes is needed, it must be
retrieved acyclically or using FlatStream.
Data type
Value
Information
IEEE745 SPF
32-bit data type with valid value
REAL
0x7FA00000
Not a number (NaN) with invalid value
PvUnit
Name:
PvUnit_01 to PvUnit_15
These registers return a HART-specific code that specifies the unit for the measured value. The coding for this is
established in the HART specification.
Data type
Value
USINT
See description of the HART slave
See HART specification
PvSampleTime
Name:
PvSampleTime01 to PvSampleTime02
PvSampleTime01_01 to PvSampleTime01_15
PvSampleTime02_01 to PvSampleTime02_15
These registers return the timestamp for when the module reads the current channel mapping. The values are
provided as signed 2-byte or 4-byte values.
Data type
Values [µs]
Information
INT
-32768 to 32767
Nettime timestamp of the current input value
DINT
-2,147,483,648
to 2,147,483,647
Nettime timestamp of the current input value
This refers to the point in time when the HART master receives the slave's response. This is a way to check whether
new HART information has been read since the last X2X cycle.
Information:
The cycle times of a HART network are relatively long so that it is not possible to reliably determine
when the measured value is retrieved with just this information.
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