Siemens SIMATIC S7-1200

Extended instructions
9.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)
S7-1200 Programmable controller
416 System Manual, V4.2, 09/2016, A5E02486680-AK
Parameters
The following table shows the parameters of the PRVREC instruction:
Parameter
Declara-
tion
Data type
Description
MODE
IN
Int
Mode
F_ID IN HW_SUBMODULE Subslot in the transfer area of the I-
device for the data record to be
sent (only relevant for MODE = 2). The high word is always set to
zero.
CODE1
IN
Byte
Zero (for MODE = 3) and/or Error Code 1 (for MODE = 4)
CODE2
IN
Byte
Zero (for MODE = 3) and/or Error Code 2 (for MODE = 4)
LEN
IN
UInt
Maximum length of the data record to be sent in bytes
NEW
OUT
Bool
The new data record was requested by the higher-level controller.
STATUS OUT DWord Error information. Refer to "STATUS parameter" (Page 403) for
more information.
SLOT
OUT
HW_SUBMODULE
Identical to F_ID
SUBSLOT
OUT
HW_SUBMODULE
Identical to F_ID
INDEX
OUT
UInt
Number of the data record to be sent
RLEN
OUT
UInt
Length of the data record to be sent
RECORD
IN_OUT
Variant
Data record made available
9.3.10.4
DPNRM_DG (Read diagnostic data from a PROFIBUS DP slave)
You can use the DPNRM_DG (Read diagnostic data) instruction with PROFIBUS.
Table 9- 93 DPNRM_DG instruction
LAD / FBD
SCL
Description
ret_val := DPNRM_DG(
req:=_bool_in_,
laddr:=_word_in_,
record=>_variant_out_,
busy=>_bool_out_);
Use the DPNRM_DG instruction to read the current diagnostic data of
a DP slave in the format specified by EN 50 170 Volume 2,
PROFIBUS. The data that has been read is entered in the destination
area indicated by RECORD following error-free data transfer.