B.5 Hart Variable Data Record - Siemens SIMATIC ET 200SP HA Manual

B.5 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 64 HART variables are available to be read in HART variable data record
121.
Each HART variable consists of a 4-byte real value and one byte of 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 15
300...319
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).
Analog Input Module AI 16xI 2-wire HART HA ( 6DL1134-6TH00-0PH1)
Manual, 11/2017, A5E39408968-AB
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 operating data records

B.5 HART variable data record

Primary Variable (PV)
Secondary Variable (SV)
Tertiary Variable (TV)
Quaternary Variable (QV)
71