Siemens SIMATIC ET 200SP Manual page 37

Channel parameters
Each channel parameter block contains the cable parameters for the digital input (4 bytes).
The following figure shows the configuration of the channel parameters for channels 0 to 15.
x = 12 + (channel number * 4); with channel number 0...15
All unused bits and the bits or bytes marked as "reserved" must be set to zero.
You activate a channel parameter by setting the corresponding bit to "1" or the corresponding
value.
Figure A-3
Digital Input Module DI 16x24VDC HA (6DL1131-6BH00-0PH1)
Manual, 05/2017, A5E39265608-AA
Drivers, parameters, diagnostics messages and address space
A.3 Parameter assignment and structure of the module/channel parameters
Configuration byte x to x+3 for the channels 0 to 15
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