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Description
The quality code is structured as follows:
Bit
The quality codes generated by the I/O module conform to the HART revision of the field device
used.
• Field devices with HART revision 5 and 6 (Page 87)
• Field devices with HART revision 7 and higher (Page 88)
8.4.4
HART revision
8.4.4.1
Field devices with HART revision 5 and 6
Definition
The quality code is formed exclusively from the 1st and 2nd status byte (HART device status) of
the response frames (HART command 3).
Description
The quality code of field devices with HART revision 5 and 6 is structured as follows:
Quality code
80
H
78
H
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
7....6
5....2
Quality
Sub-status
0 0: Bad
Coded according to "PROFIBUS PA Pro‐
0 1: Uncertain
file for Process Control Devices"
1 0: Good
1 1: Good
Meaning (process status)
Value is okay
Value is uncertain
HART function
1...0
Limits
0 0: OK
0 1: Low limit
1 0: High limit
1 1: Constant
Also applies when the following bits
are set in the 2nd status byte of the
HART response frame:
•
Configuration changed
•
Startup (cold start)
•
Fixed analog output current setting
Also applies when the following bits
are set in the 2nd status byte of the
HART response frame:
•
Additional status information avail‐
able
•
Analog output current saturated
•
Secondary variable outside the lim‐
its
•
Primary variable outside the range
8.4 Tags
87
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