Description
The quality code is structured as follows:
Bit 7….6 5....2 1…0
Quality
0 0: Bad
0 1: Uncertain
1 0: Good
1 1: Good
Sub-status
Coded according to "PROFIBUS PA Pro‐
le for Process Control Devices"
Limits
0 0: OK
0 1: Low limit
1 0: High limit
1 1: Constant
The quality codes generated by the I/O module conform to the HART revision of the eld 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
Denition
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 eld devices with HART revision 5 and 6 is structured as follows:
Quality code Meaning (process status)
80
H
Value is okay Also applies when the following bits
are set in the 2nd status byte of the
HART response frame:
• Conguration changed
• Startup (cold start)
• Fixed analog output current setting
78
H
Value is uncertain 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
HART function
8.4 Tags
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA 87