Siemens SIMATIC ET 200SP HA Manual page 68

HART operating data records
B.2 HART job and response data records
You can learn when the response from the field device was received by cyclically reading data
record DS81 for HART channel 0. The response is always supplied in transparent message
format.
Table B-3
m3: CALL SFB52, DB52
The program part A M 49.1 to SPB m3 is only required if reading is to occur within a block
cycle.
As long as the processing status (byte 0 of DB81) is at 3 (waiting, executing), the response
has not yet been received from the field device. As soon as the processing status changes to
greater than 3, the HART request is finished.
With a processing status of 4, the request finished without errors and the response data can
be evaluated.
With a processing status of 5, the request also finished without errors but without response
data from the field device.
With a processing status of 6 or 7, the request finished with errors. You can find more detailed
information in byte 1 of DB81 (see table "HART group fault display") and for a HART protocol
error also in byte 2 of DB81 (see table "HART protocol error during response").
68
FC81: Reading of the response to DB81 with SFB 52
REQ :=M1
ID :=DW#16#200
INDEX :=81
MLEN :=200
VALID :=M49.7
BUSY :=M49.1
ERROR :=M49.6
STATUS :=MD100
LEN :=MW104
RECORD :=P#DB81.DBX0.0 BYTE 200
A M 49.1
SPB m3
BE
Explanation
Read request
Module address
Data record number 81
Target length
Block status or error information
Target area in DB81
Analog Input Module AI 16xI 2-wire HART HA ( 6DL1134-6TH00-0PH1)
Manual, 11/2017, A5E39408968-AB