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HART Program User Manual
Device Tag — Enter up to ten characters to identify the HART Point being defined in this screen. Any
alphanumeric characters, including spaces, may be used. This field is a read/write field that
displays or modifies the tag residing in the HART device. If you change the Device Tag for a
multi-drop device, the new Device Tag in the Config Hart Point display is also changed.
If you change or enter a new Device Tag, you must perform a Write Changes update. Refer to
the Update Flag parameter on page 5-4.
Device Num — Indicates the device number of the current Hart Pt Num. In the point-to-point mode,
the device number is always 1. In multi-drop mode, the Device Number is a number from 1 to
5, depending on the number of HART devices configured on this channel.
Hart Pt Num — When using the HART Interface Card program in a ROC306 or ROC312, this field
displays the built-in analog input channel (1 to 3) to which this device is connected.
When using the HART Interface Module program in a ROC312, ROC364, or FloBoss 407, this
field displays the HART channel number within the module. Channel numbers increment by
two for every HART module installed (to a maximum of 12), starting with the first rack
location. For example:
♦
♦
♦
♦
Module 1, Channel A = HART Point 1
Module 1, Channel B = HART Point 2
Module 2, Channel A = HART Point 3
Module 2, Channel B = HART Point 4
Soft Point — This enables the HART data to be mapped to one of the ROC Soft Points. A “0” entered
into this field disables the writing of HART data to a Soft Point. Entering a number from 1 to
32 allows the HART data to be written to the corresponding Soft Point (1 to 32). Any number
entered above 32 is invalid and will be reset to zero. See Appendix A for the mapping of HART
data into a Soft Point.
Update Counter — This counter updates every time a valid response is received from the HART
device connected to this point.
Primary Value — The Primary Value (process variable – PV) as read from the HART device. The PV
is setup in the HART device and cannot be altered from the ROC. This is a measured quantity
originating in the process such as pressure, temperature, flow, or a value derived from these like
the HART Dynamic Variables.
Primary Units — The units configured in the device for the Primary Value (PV) such as InH2O.
Primary Current — The current of the HART device loop in milliamps. In point-to-point mode, this
value varies between 4 and 20mA. In the multi-drop mode, this value is fixed typically at 4mA.
Primary Percent — This field displays the HART device loop current as a percentage value.
5-2
Rev 3/99