Address Space Counting Mode - Siemens Simatic series Manual

The following figure shows the assignment of the address space with submodules 3 and 4
and the value status.
Figure 4-4
Reference
You can find information on the module-internal shared input/shared output (MSI/MSO)
function in the section Module-internal shared input/shared output (MSI/MSO) of the function
manual PROFINET with STEP 7 V13
(http://support.automation.siemens.com/WW/view/en/49948856).
4.2.2

Address space Counting mode

Address space for configuration as 1 x 16-channel DI 16x24VDC Count
The address space of channel 0 and channel 1 used for counting consists of the control and
feedback interface. The Count function is controlled directly via the two interfaces. With
suitable parameter assignment, a hardware interrupt is triggered.
If you use the module in the "Counting mode" (channels 0 and 1), the module occupies the
following address areas:
● 16 bytes in the process image output (control interface).
● 20 bytes in the process image input (feedback interface).
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 08/2018, A5E03485952-AG
Address space for configuration as 1 x 16-channel DI 16x24VDC HF MSI
Parameters/address space
4.2 Address space
25