Understanding of the regulations

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I would like to ask everyone: in chemical engineering standards, regarding the division of responsibilities between instrumentation and electrical systems, under Article 3 on interlock systems, 3.0.5 stipulates that for the cables used in interlock systems between the automation team and the electrical team, the \"transmission method\" should be adopted in principle. That is, the party providing the contacts is responsible for the design, procurement, and installation of the cables, delivering them to the receiver’s terminal box and providing cable identifiers, while the receiver is responsible for providing terminal identifiers. 3.0.6 For the interlock system cables between the control room and the Motor Control Center (MCC), in order to ensure rational design and cost efficiency, the electrical engineering department is responsible for the design, procurement, and installation of all such cables, which are then delivered to the I/O terminal cabinets or busbar cabinets in the control room. The routing of cables within the control room should be discussed between the electrical team and the automation team. Article 3.0.6 is easy to understand. May I ask what kind of chains are referred to in Article 3.0.5? Please list one or two. Thank you!