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A.6
HART variable data record
The I/O module supports a maximum of 4 HART variables per channel in enabled HART
operation. These variables are read cyclically, provided they are supported by the connected
field device.
These 32 HART variables are available to be read in HART variable data record 121.
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
Channel 0
0...3
4
5...8
9
10...13
14
15...18
19
Channel 1
20...39
Channel 2
40...59
Channel 3
60...79
Channel 4
80...99
Channel 5
100...119
Channel 6
120...139
Channel 7
140...159
If HART is not enabled or the respective HART variable is not supplied from the connected field
device, the corresponding variable = 0 and the QC = 0x37 (initialization value from the analog
module).
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
Meaning
Value
Quality Code
Value
Quality Code
Value
Quality Code
Value
Quality Code
HART variables same as for channel 0
HART variables same as for channel 0
HART variables same as for channel 0
HART variables same as for channel 0
HART variables same as for channel 0
HART variables same as for channel 0
HART variables same as for channel 0
HART operating data records
A.6 HART variable data record
Primary Variable (PV)
Secondary Variable (SV)
Tertiary Variable (TV)
Quaternary Variable (QV)
105
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