Installation, Operation and Maintenance Manual
MDE 254 Rev. 1 March 2021
HART Command Set 43
Section 8: HART Command Set
Code Device Variable Classification
0 Device Variable Not Classified
1 - 63 Reserved
64 Temperature
70 Time
80 Frequency
83 EMF (Electromagnetic Unit of Electric Potential)
91 Valve Actuator
Code Flag Definition
0x01
This Analog Channel is a Field Device analog input channel. In other words, the Field
Device has an ADC connected to this channel when this bit is set.
Code Loop Current Mode Description
0 Disabled
1 Enabled
Code Description
00 Undefined
01
Maintenance Required. This bit is set to indicated that, while the device has not
malfunctioned, the Field Device requires maintenance.
02
Device Variable Alert. This bit is set if any Device Variable is in Alarm or Warning
State. The host should identify the Device Variable(s) causing this to be set using the
Device Variable Status indicators.
04
Critical Power Failure. For devices that can operate from stored power. This bit is set
when that power is becoming critically low.
08 - 80 Undefined
Code Device Variable Family
0 - 3 Reserved
4 Temperature
5 Pressure
6 Valve / Actuator
7 Simple PID Control
8 pH
9 Conductivity
10 Totalizer
11 Level
12 Vortex Flow
13 Mag Flow
14 Coriolis Flow
132 - 249 Reserved
250 Not Used
Table 131. Device Variable Classification Codes
Table 132. Analog Channel Flags
Table 128. Loop Current Mode Codes
Table 129. Extended Device Status Codes
Table 130. Device Variable Family Codes
NOTE: Only Classification Codes used by HRT2000v4 are listed.
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