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1771-P4SB A-B
1771-P4SB A-B是一款由Allen-Bradley（A-B）公司推出的可编程逻辑控制器（PLC）的扩展模块。它提供了与PLC之间的通信接口，使得用户能够方便地扩展PLC的功能和输入输出能力。
规格：
- 接口类型：SPI 4.2接口，分为数据通道和状态通道。
- 数据通道配置：多分成256个逻辑通道，16bit位宽，采用LVDS信号电平。
- cell格式：cell的长度为16字节的整数倍，可随意配置，通常配置成128字节。
- 控制字：每个cell以控制字开始，包含逻辑端口号、报文起始标志位、报文结束标志位、控制字交验等信息。
作用特征：
- 通信扩展：通过此模块，用户可以扩展PLC的通信能力，与其他设备或系统进行数据交换。
- 灵活性：cell格式和长度的可配置性使得该模块能够适应不同的通信需求。
- 稳定性：采用成熟的通信协议和信号处理技术，确保数据传输的稳定性和可靠性。
应用领域：
该模块广泛应用于工业自动化、控制系统集成、设备监控等领域，特别适用于需要扩展PLC通信能力的场景。
The 1771-P4SB A-B is an expansion module for programmable logic controllers (PLCs) offered by Allen-Bradley (A-B). It provides a communication interface with the PLC, enabling users to conveniently expand the functionality and input/output capabilities of the PLC.
Specifications:
- Interface Type: SPI 4.2 interface, consisting of data channels and status channels.
- Data Channel Configuration: Divided into 256 logical channels with a 16-bit width, utilizing LVDS signal levels.
- Cell Format: Cells have a length that is an integer multiple of 16 bytes, configurable to suit different needs, typically configured as 128 bytes.
- Control Word: Each cell begins with a control word containing information such as the logical port number, start and end flags for the message, and control word verification.
Functional Characteristics:
- Communication Expansion: Through this module, users can expand the communication capabilities of the PLC for data exchange with other devices or systems.
- Flexibility: The configurable cell format and length allow the module to adapt to different communication requirements.
- Stability: Utilizing mature communication protocols and signal processing techniques ensures stable and reliable data transmission.
Application Areas:
This module is widely used in industrial automation, control system integration, equipment monitoring, and other fields, especially in scenarios where expansion of PLC communication capabilities is required.
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