II - DCE FEL ČVUT v Praze

Examples of HART
parameters
Examples of HART
commands
Burst mode
Data and status
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
The following table shows the HART parameters of the different groups:
Table 4-1 Examples of HART parameters
Parameter group HART field device parameters
Universal Measured or manipulated value (primary variable),
manufacturer name, device ID(“tag”), or ID for
actuator, other measured or manipulated values
Common-practice Measuring range, filter time, interrupt parameters
(message, interrupt and warning limits), output area
Device-specific Special diagnostic information
The following two tables provide examples of commands:
Table 4-2 Examples of universal commands
Command Function
0, 11 Read manufacturer and device type
1 Read primary variable (PV) and units
2 Read current output and percentage of range as digital
floating-point number (IEEE 754)
3 Read up to four pre-defined dynamic variables (primary
variables, secondary variables, etc.)
13, 18 Read or write tag, description, date (data included)
Table 4-3 Examples of common-practice commands
Command Function
36 Set the upper range value
37 Set the lower range value
41 Perform device self-test
43 Set primary variable to zero
109 Switch burst mode on or off
SIMATIC S7 HART Analog Modules
In burst mode, a command initiates a cyclic response from the slave device.
This response is sent repeatedly until the mode is deactivated by the master
device.
HART commands are often transmitted without data, because they are used
to start a processing function. HART responses always contain data. A HART
response is always accompanied by status information, which you should
evaluate to check that the response is correct.
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