Cpu 1215 DPWR_DAT on onboard 2AQ

Hello,
I am using the functions for DPRD_DAT and DPWR_DAT to read the I / O of the cpu and the decentralized periphery. The functions work correctly except on the onboard analog outputs of the 1215 CPU.

As described below I have inserted the following instructions:

"Ret_Val_Int" := DPRD_DAT(LADDR := "Local~AI_2_AQ_2_1", RECORD =>"CPU IO".CPU."CPU - AI 2 AQ 2_1"."AI Value");

"Ret_Val_Int" := DPWR_DAT(LADDR := "Local~AI_2_AQ_2_1", RECORD := "CPU IO".CPU."CPU - AI 2 AQ 2_1"."AQ Value");

"AI Value" and "AQ Value" are both structures consisting of two integers.
The DPRD_DAT instruction gives result 0, while the DPWR_DAT returns 80A1. Trying to comment on the DPRD_DAT I have the same result on the write function.
Where am I doing wrong?

Hello Valentin;

DPRD_DAT and  DPWR_DAT cannot process data amounts of 4 bytes and less, so they cannot be used with 2AI and 2AQ.

Read the Note in the following article:

https://support.industry.siemens.com/cs/ww/en/view/245111

For data in the size of 2 words/integers or 1 Dword/Dint you must use standard read/write access to the module addresses.

Hope this helps,

Daniel Chartier 

Hello Valentin;

It seems I will have to re-examine my understanding of these functions then, if you are able to read/write consistent data from modules with 4 bytes and less. 

In the meantime, do you have a fault code in Ret_Val when you call DPRD_DAT?

https://support.industry.siemens.com/cs/us/en/view/109755202/95340531851

Hope this helps,

Daniel Chartier 

See the image below.
Reading works correctly. Writing makes 16 # 80A1 (-32607 converted).

80A1
Access error detected while I/O devices were being accessed.