Siemens SIMATIC ET 200AL System Manual page 943

The figure below shows the assignment of the address space for the F-DI 4/F-DQ 2 Fail-Safe
module with value status (Quality Information (QI)).
Figure 4-3
Evaluating the value status
The value status bits provide information regarding the validity of the digital values or
channel status:
• Bit = 1: Corresponding process value is valid
• Bit = 0: Channel is passivated
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
Address space
Parameters/address space
4.4 Address space
37