B.4 HART feature data
Structure of the HART feature data
Byte Meaning Comment
0 Byte 0 = 0x62
Bit 1 = 1: "Parameter check result is given with a read response"
Bit 5 = 1: "Compact format is supported"
Bit 6 = 1: "SHC mode is supported"
1 Byte 1 = 0
2 Max Length Da‐
ta Unit
= 230 (maximum length of the HART request data records)
B.5 HART variable data record
The I/O module supports a maximum of 4 HART variables per channel when HART mode is
enabled. Provided they are supported by the connected eld device, these variables are ready
cyclically.
The total of 16 HART variables are made available in HART variable data record 121 as readable
variables.
Each HART variable consists of a 4-byte real value and 1-byte quality code.
In IO redundancy mode, the HART variables are only updated if the HART interface is on the
corresponding module/channel. The channel may not be in standby mode. If the HART interface
is on the partner module/partner channel, the corresponding HART variable is initialized (quality
code = 0x37).
Structure of the HART variable data record
Byte Meaning
Channel 0
0…3 Value Primary Variable (PV)
4 Quality Code
5…8 Value Secondary Variable (SV)
9 Quality Code
10…13 Value Tertiary Variable (TV)
14 Quality Code
15…18 Value Quaternary Variable (QV)
19 Quality Code
Channel 1
20…39 HART variables same as for channel 0
Channel 2
40…59 HART variables same as for channel 0
HART operating data records
B.5 HART variable data record
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB 81
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