Siemens SIMATIC 6DL1 136-6AA00-0PH1 - HART Request and Response Data Records

A.3 HART request and response data records
HART commands are processed on a channel-speci󹪝c basis via a separate command interface
with one request data record and one response data record in each case.
Channel Data record number
Request to the 󹪝eld device Response from the 󹪝eld device
0 80 81
1 82 83
2 84 85
3 86 87
4 88 89
5 90 91
6 92 93
7 94 95
Structure of request data records 80 to 94
Byte Meaning Comment
0 Request control
1 Number of preamble bytes 5…20, 255
2…239 Communication data according to HART speci󹪝ca‐
tion
"Request control" coding:
Bit 0…1: Reserved = 0
Bit 2: 0 = Parameters are not checked
Bit 3...4: Reserved = 0
Bit 5: 0 = Transparent format
1
1 = Compact format
Bit 6: 1 = Enable SHC mode
2
Bit 7: 0 = HART Request
1
HART commands are processed by the I/O module in both transparent message format and
compact message format. However, the response data from the module is always made
available in transparent message format.
2
Processing of a sequence of HART commands as an SHC sequence a󹪜ects all other channels
with HART activated.
HART operating data records
A.3 HART request and response data records
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA 97