In a PLC (Programmable Logic Controller), a function module is a module or plug-in specifically designed to perform a specific control function. Each functional module has specific input and output interfaces, as well as a set of built-in control algorithms to achieve a specific task or function. These functional modules can be added to the PLC system as needed to expand its functionality.

Communication module: Used for data communication with other devices or systems, such as Ethernet module, serial communication module, wireless communication module, etc.

Positioning module: used to control motion devices to achieve precise positioning and positioning control, usually used in mechanical devices and automated production lines.

Pulse Output Module: Used to generate pulse signals typically used to control stepper motors, servo motors, and other motion control applications.

High-speed counting module: For high-speed counting and frequency measurement, typically used for monitoring fast motion and counting applications.

PID control module: Used to implement proportional-integral-derivative (PID) control, often used for temperature control, flow control, pressure control, etc.

Temperature control module: Specially used to monitor and control temperature, usually including temperature sensor interface and control algorithm.

Analog input/output module (AI/AO module): used to input analog signals (such as temperature, pressure, liquid level, etc.) into the PLC system, or convert the output signals of the PLC system into analog signals to control various types of the actuator.

Counting module: used for accumulation of count values or frequency measurement, often used for piece counting or time control.

Position control module: used to control the position of servo motors or other motion devices to achieve precise positioning and position control.

Cam controller module: used to simulate the cam controller output, often used to simulate the control process.

Frequency converter module: used to convert analog signals into digital signals, or digital signals into analog signals, to achieve communication between PLC and analog equipment.

Display module: used to display real-time data, status, or fault information in the PLC system to facilitate operator monitoring and operation.

Stepper motor drive module: used to control the speed and rotation angle of stepper motors, often used in position control and positioning applications.

Bus module: used to expand the input and output points of the PLC system and improve system performance.

Safety module: used to implement the safety protection functions of the PLC system, such as emergency stop, safety door locks, etc.

PID regulator module: used to implement proportional-integral-derivative (PID) control algorithm to regulate various process variables.