Siemens SIMATIC S7-1500 Manual page 31

Note
You may only access the addresses occupied by user data and value status.
The other address areas occupied by the F-modules are assigned for functions including
safety-related communication between the F-modules and F-CPU in accordance with
PROFIsafe.
Additional information
For detailed information about F-I/O access and for evaluation and processing of the value
status, refer to the SIMATIC Safety – Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126) manual.
Digital output module F-DQ 8x24VDC/2A PPM (6ES7526-2BF00-0AB0)
Manual, 01/2016, A5E03858037-AA
Parameters/address space
4.3 Address space
31