Hart Variable Data Record - Siemens SIMATIC ET 200SP Manual

B.5

HART variable data record

The I/O module AI-DI 16/DQ16x24VDC HART HA supports a maximum of 4 HART variables
per channel when HART mode is enabled. Provided they are supported by the connected field
device, these variables are ready cyclically.
These 64 HART variables are available to read in HART variable data record 121.
Each HART variable consists of a 4-byte real value and one byte of quality code. See section
HART variables (Page 42) under 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 a given HART variable is not supplied by the connected field device,
variable = 0 and QC = 0x37 (initialization value of the I/O module) is set.
Input/output module AI-DI 16/DQ16x24VDC HART HA (6DL1133-6EW00-0PH1)
Manual, 05/2017, A5E39294170-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 operating data records
B.5 HART variable data record
Primary Variable (PV)
Secondary Variable (SV)
Tertiary Variable (TV)
Quaternary Variable (QV)
89