Dear experts, what is the meaning of an interlock logic system?

An interlock logic system is a type of system used to control industrial production processes; it ensures that the interactions between various devices or processes take place in accordance with specified sequences and conditions, thereby maximizing production safety and efficiency. In actual DCS or SIS systems, the interlock logic system is typically located in the central part of the control system; it is responsible for managing and controlling the interactions between various subsystems, and it achieves control and protection functions through signal transmission, pressure differences, and other means. .

So, how many actuators and controllers can a interlock logic system be connected to at the same time?

A logic system is a software language that determines the order in which control parameters are applied and how actions should be carried out; once the conditions are met, it proceeds to execute the predetermined actions.

What do the four corners of the diamond-shaped symbol for interlock logic represent?

Logical control is control that follows the rules governed by Boolean algebra (AND, OR, NOT, monostable, bistable, timing). In addition to performing logical operations, a logic control system also includes functions such as information acquisition and the execution of the results of those operations. That diamond shape, although it represents a control logic system, is in most cases used merely to indicate the logical operations carried out by computers (DCS, SIS, PLCs, etc.), or standalone processing units (such as groups of relays or complete hydraulic control systems). As for data acquisition and actuation units, even if they have logical functions, these are expressed through direct hardware connections (for example, by using multiple solenoid valves together). Therefore, the diamond icons in the PID diagram generally do not point to specific devices; it is necessary to determine which device is responsible for performing a particular function based on the functions that need to be implemented and the task allocation for those functions during the design phase. .