Siemens Simatic S7-1500 Manual - Page 16

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Parameters/address space

4.2 Address space

4.2
Address space
Address space of DI 16x24VDC HF
The following figure shows the address space allocation for the configuration as 16-channel
DI 16x24VDC HF with value status (Quality Information (QI)). The addresses for the value
status are only available if the value status is enabled.
The letters "a" and "b" are printed on the module. "IB a" represents the module start address.
Figure 4-1
Configuration options of DI 16x24VDC HF
The following configurations are possible:
● Configuration 1: 1 x 16-channel (no value status)
● Configuration 2: 1 x 16-channel (with value status)
Evaluating the value status
An additional two bytes are allocated in the input address space if you enable the value
status for the digital module. Each bit in this byte is assigned to a channel and returns
information about the validity of the digital value (0 = incorrect value).
16
Address space of DI 16x24VDC HF with value status
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01