Siemens SIMATIC S7 Functional Safety Manual page 37

To check the Process value bits and the Quality bits, you must know where these bits are
mapped in the module. For an F-DI 8/16x24VDC_1, the first two bytes of the input (I)
image register are the Process value bits, and the next two bytes of the input (I) image
register are the Quality bits. For example, if the module starting address is I8.0 and Q8.0
for the F-DI 8/16x24VDC_1 and you have a 1oo1 configuration, then the Process value
bits and corresponding Quality bits are allocated as shown in the following table:
If you have a 1oo2 configuration, then the Process value bits and corresponding Quality
bits are allocated as shown in the following table:
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Process value
I8.0
I8.1
I8.2
I8.3
I8.4
I8.5
I8.6
I8.7
I9.0
I9.1
I9.2
I9.3
I9.4
I9.5
I9.6
I9.7
Process value
I8.0
I8.1
I8.2
I8.3
I8.4
I8.5
I8.6
I8.7
-
-
-
-
-
-
-
-
Getting started
2.2 Configuring
Quality bit
I10.0
I10.1
I10.2
I10.3
I10.4
I10.5
I10.6
I10.7
I11.0
I11.1
I11.2
I11.3
I11.4
I11.5
I11.6
I11.7
Quality bit
I10.0
I10.1
I10.2
I10.3
I10.4
I10.5
I10.6
I10.7
-
-
-
-
-
-
-
-
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