Siemens SIMATIC ET 200AL, System Manual

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Counting
4.1 Configuration method 2xCount
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
Equipment Manual, 08/2021, A5E38688112-AD
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4.1.2.3 Assignment of the control interface
The user program uses the control interface to influence the behavior of the counters and the
channels 8...15 of the module parameterized as an output.
The figure below shows the address assignment of the module in the process image output
in the configuration method 2xCount.
At Counter 0 x stands for the output byte QB 2 in this case, at Counter 1 you add 6 bytes to
this output byte.
When you assign a different start address to the digital input/digital output module, the byte
sequence changes correspondingly.
Figure 4-2 Address space control interface configuration method 2xCount