  Adapting security architectures to common standards like IEC 62443 or ISO
27000 in the Industrial Internet of Things (IIoT) involves complex processes
and compliance reports. Automatic monitoring of compliance status would enhance
this process. Despite limited research, practical applications exist. This
paper conducts a market study on providers implementing IEC 62443 in IIoT,
aiming to formulate a catalog of monitorable attributes aligned with the
standard. The study reveals challenges, such as a lack of formal separation in
security architectures, limiting visibility. Despite these challenges,
practical implementations share commonalities, providing insights into viable
monitoring properties. The research serves as a crucial entry point into
developing a comprehensive catalog of monitorable attributes for IEC 62443
standards in IIoT.
  Aligned with the IEC 62443 SR catalog of document 3-3, monitorable attributes
are derived based on current research about IIoT security and Expert Knowledge.
The provided tables serve as an exemplary extract, not exhaustive, defining
three types of attributes based on their origin of creation.
