CAN Communication Port in the LK3U/ZK3U Series

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The LK3U/ZK3U series comes equipped with a CAN communication port, offering a powerful and flexible communication interface for industrial automation systems. The CAN (Controller Area Network) communication port allows for efficient data exchange between devices, enabling real-time control and monitoring in industrial applications. This port supports two primary working modes: Register Sharing Mode and Expansion Mode. Let’s break down the features and functionalities of these two modes.

Register Sharing Mode

Register sharing mode is akin to an Nnetwork, where multiple devices (hosts and slaves) can exchange data through shared registers. In this mode:

  1. Host and Slave Configuration:
    • A single host can manage communication with up to 32 slaves, with each slave having an address within the range of 1-32.
    • Every station (host or slave) can share up to 32 registers, allowing for flexible data sharing across the network.
  2. Data Access:
    • Both the host and slaves have the ability to read and write registers that are shared by other machines on the network. Each machine is assigned a specific register address range, as defined in the product documentation.
  3. Baud Rate Settings:
    • The baud rate, or the speed of communication, can be set at different levels depending on the system’s requirements, ranging from 20K to 1000K. If an unsupported baud rate is selected, the system will automatically default to 250K.
  4. Addressing Rules:
    • It is crucial to ensure that no two devices (host or slave) have the same address. If there is an address conflict, fault codes 6373 and 6374 will be triggered.

This mode is particularly useful for systems where multiple devices need to interact and share data in a synchronized manner, ensuring smooth operation across the network.

Expansion Mode

Expansion mode enables the connection of specialized expansion modules that extend the functionality of the main PLC (Programmable Logic Controller). The expansion mode provides seamless integration with additional modules such as digital, analog, temperature, and weighing modules. Here are the key aspects of this mode:

  1. Expansion Modules:
    • The host PLC can connect up to 15 expansion modules. Each module has a fixed function based on its designated number. For instance, if module No. 1 is assigned as an E8X8Y module, trying to connect an E16Y module in its place will result in a communication failure.
  2. Plug-and-Play Functionality:
    • No initialization or complex setup is required in expansion mode. The modules are plug-and-play, which means they can be added or removed from the system without needing to modify the PLC’s program.

This mode is ideal for systems that need to be expanded with additional hardware components while maintaining simplicity in setup and use.

Summary of Features:

  • Two Operating Modes: Register Sharing Mode and Expansion Mode.
  • Flexible Baud Rate: Adjustable communication speed from 20K to 1000K.
  • Address Management: Up to 32 slaves in Register Sharing Mode, ensuring no address duplication to avoid faults.
  • Plug-and-Play Expansion: Connect up to 15 specialized modules without additional programming.

Conclusion

The CAN communication port in the LK3U/ZK3U series PLCs provides robust and versatile communication capabilities. Whether you’re setting up a network of PLCs in register sharing mode or expanding your system with additional modules, the CAN port makes integration and data sharing efficient and straightforward.

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