描述
一、产品概述
ABB CM574-RS是ABB工业自动化部门推出的串口通信接口模块，属于CM（Communication Module）系列。其核心功能是为AC800M PLC提供灵活的串口通信能力，支持Modbus RTU、DNP3、ASCII、自定义协议等，并可通过透明传输模式直接连接legacy设备（如仪表、变频器、打印机）。
该模块通常与AC800M PLC配合使用，也可通过OPC UA或EtherNet/IP与第三方系统（如SCADA、MES）集成，实现数据采集、远程监控及设备互联。
二、核心功能与特性
多协议串口通信支持
物理层兼容性：
RS232：全双工，最大波特率115.2kbps，适用于短距离通信（如连接打印机、调试终端）。
RS485：半双工，最大波特率1.5Mbps（部分型号支持12Mbps），支持多点通信（最多32个节点），适用于长距离（≤1200m）或抗干扰场景（如工业现场）。
RS422：全双工，最大波特率10Mbps，适用于高速数据传输（如视频监控、运动控制）。
协议支持：
Modbus RTU：主站/从站模式，支持功能码01-06、15-16（读/写线圈、寄存器）。
DNP3：主站/从站模式，支持Level 2/3功能（如时间同步、事件记录）。
ASCII协议：支持自定义ASCII指令集，兼容legacy设备（如老式仪表）。
透明传输：允许用户通过TCP端口或PLC内存映射直接访问串口数据，无需协议解析，简化调试流程。
高性能数据传输
硬件加速：内置专用ASIC芯片，实现串口数据到以太网的透明转发，延迟≤1ms（典型值），满足实时控制需求。
缓冲机制：配备16KB发送/接收缓冲区，防止数据丢失（如高波特率下的突发流量）。
流控制：支持RTS/CTS硬件流控或XON/XOFF软件流控，确保数据完整性。
协议转换与设备集成
跨协议通信：通过内置协议转换引擎，实现Modbus RTU↔DNP3、ASCII↔Modbus RTU等转换，无需额外网关设备。
多主站支持：单个CM574-RS模块可同时作为2个独立串口的主站（如Port1:Modbus RTU主站，Port2:DNP3主站），连接不同协议设备。
设备映射：支持将串口设备映射为AC800M PLC的I/O变量，通过Control Builder M工程工具直接配置，简化编程逻辑。
边缘计算与本地决策
轻量级边缘引擎：内置Lua脚本解释器或C语言运行环境，允许用户编写自定义逻辑（如数据预处理、报警阈值判断），减少PLC核心负载。
本地存储：支持SD卡扩展（最大32GB），可存储历史数据、配置文件或日志，便于离线分析。
定时任务：提供硬件定时器，支持周期性数据采集（如每100ms读取一次仪表）或事件触发任务（如超限报警时执行特定动作）。
安全与诊断功能
访问控制：支持IP过滤、用户权限分级，防止未授权访问串口或模块配置界面。
自诊断：通过LED指示灯和Web界面实时显示串口状态、协议错误、硬件故障等信息，支持SNMP v2c/v3陷阱（Trap）发送告警至上位系统。
固件安全：采用Secure Boot和AES-128加密固件升级，防止恶意代码注入，符合IEC 62443-3-3工业网络安全标准。
环境适应性与可靠性
工作温度：-25℃至+70℃（宽温型号），适应极端环境（如户外、高温车间）。
防护等级：IP20（标准机柜安装），可选IP65防护外壳用于防尘防水场景。
抗振动/冲击：符合IEC 60068-2-6标准，可在振动频率5-500Hz、加速度5g环境下稳定运行。
电磁兼容性（EMC）：通过IEC 61000-4-2/3/4/6测试，抵抗静电放电、浪涌、射频干扰等工业噪声。
三、典型技术参数
参数类别详情
型号CM574-RS（基础版）、CM574-RS-Pro（高性能版）
串口接口2×独立串口（可配置为RS232/RS485/RS422）
最大波特率RS232:115.2kbps；RS485/RS422:1.5Mbps（标准版），12Mbps（Pro版）
协议支持Modbus RTU、DNP3、ASCII、透明传输、自定义协议
处理能力每端口最大500个Modbus RTU连接，或200个DNP3连接
边缘计算Lua 5.3脚本支持、C语言运行环境（需授权）、16KB脚本内存
存储扩展MicroSD卡槽（最大32GB，FAT32/exFAT文件系统）
电源输入24V DC（±20%），功耗≤10W
尺寸（W×H×D）35mm×125mm×120mm（DIN导轨安装）
重量约0.6kg
认证标准CE、UL 508A、cULus、ATEX（Zone 2）、IECEx
1.Product Overview
ABB CM574-RS is a serial communication interface module launched by ABB Industrial Automation Department and belongs to the CM(Communication Module)series.Its core function is to provide flexible serial communication capabilities for AC800M PLC,support Modbus RTU,DNP3,ASCII,custom protocols,etc.,and can directly connect legacy devices(such as instruments,inverters,printers)through transparent transmission mode.
This module is usually used in conjunction with AC800M PLC,and can also be integrated with third-party systems(such as SCADA,MES)through OPC UA or EtherNet/IP to achieve data acquisition,remote monitoring and device interconnection.
2.Core functions and characteristics
Multi-protocol serial communication support
Physical layer compatibility:
RS232:Full duplex,maximum baud rate of 115.2kbps,suitable for short-distance communication(such as connecting to printers and debugging terminals).
RS485:Half duplex,maximum baud rate of 1.5Mbps(some models support 12Mbps),supports multi-point communication(up to 32 nodes),suitable for long distances(≤1200m)or anti-interference scenarios(such as industrial sites).
RS422:Full duplex,maximum baud rate of 10Mbps,suitable for high-speed data transmission(such as video surveillance,motion control).
Protocol support:
Modbus RTU:Master/slave mode,supports function codes 01-06,15-16(read/write coil,register).
DNP3:Master/slave mode,supports Level 2/3 functions(such as time synchronization,event recording).
ASCII protocol:supports custom ASCII instruction sets and is compatible with legacy devices(such as old instruments).
Transparent transmission:allows users to directly access serial port data through TCP port or PLC memory mapping,without protocol parsing,simplifying debugging process.
High-performance data transmission
Hardware acceleration:built-in dedicated ASIC chip to realize transparent forwarding of serial port data to Ethernet,with a delay of≤1ms(typical value),meeting real-time control needs.
Buffering mechanism:equipped with a 16KB send/receive buffer to prevent data loss(such as burst traffic at high baud rates).
Flow control:Supports RTS/CTS hardware flow control or XON/XOFF software flow control to ensure data integrity.
Protocol conversion and device integration
Cross-protocol communication:Through the built-in protocol conversion engine,Modbus RTU↔DNP3,ASCII↔Modbus RTU and other conversions are realized without additional gateway equipment.
Multi-master support:a single CM574-RS module can be used as a master station with 2 independent serial ports at the same time(such as Port1:Modbus RTU master station,Port2:DNP3 master station),connecting to devices of different protocols.
Device mapping:supports mapping serial devices into I/O variables of AC800M PLC,and directly configured through the Control Builder M engineering tool to simplify programming logic.
Edge computing and local decision-making
Lightweight edge engine:built-in Lua script interpreter or C language running environment,allowing users to write custom logic(such as data preprocessing,alarm threshold judgment)to reduce PLC core load.
Local storage:Supports SD card expansion(up to 32GB),which can store historical data,configuration files or logs for easy offline analysis.
Timing Task:Provides hardware timers that support periodic data acquisition(such as reading the instrument every 100ms)or event trigger task(such as performing specific actions when an alarm exceeds limit).
Safety and diagnostic functions
Access control:Supports IP filtering and user permission grading to prevent unauthorized access to the serial port or module configuration interface.
Self-diagnosis:The serial port status,protocol errors,hardware failures and other information are displayed in real time through the LED indicators and the web interface,and the SNMP v2c/v3 trap(Trap)is supported to send alarms to the upper system.
Firmware security:Secure Boot and AES-128 encryption firmware upgrades to prevent malicious code injection and comply with IEC 62443-3-3 Industrial Network Security Standard.
Environmental adaptability and reliability
Operating temperature:-25℃to+70℃(wide temperature model),adapted to extreme environments(such as outdoors,high temperature workshops).
Protection level:IP20(standard cabinet installation),optional IP65 protective shell for dustproof and waterproof scenarios.
Vibration/impact resistance:complies with IEC 60068-2-6 standards,and can operate stably in a vibration frequency of 5-500Hz and acceleration of 5g.
Electromagnetic compatibility(EMC):Passed IEC 61000-4-2/3/4/6 test to resist industrial noise such as electrostatic discharge,surge,radio frequency interference.
3.Typical technical parameters
Parameter Category Details
Models CM574-RS(basic version),CM574-RS-Pro(high performance version)
Serial port interface 2×independent serial port(configurable as RS232/RS485/RS422)
Maximum baud rate RS232:115.2kbps;RS485/RS422:1.5Mbps(standard version),12Mbps(Pro version)
Protocol supports Modbus RTU,DNP3,ASCII,transparent transmission,custom protocols
Processing capability Maximum 500 Modbus RTU connections per port,or 200 DNP3 connections
Edge Computing Lua 5.3 script support,C language running environment(authorization required),16KB script memory
Storage expansion MicroSD card slot(maximum 32GB,FAT32/exFAT file system)
Power input 24V DC(±20%),power consumption≤10W
Dimensions(W×H×D)35mm×125mm×120mm(DIN rail installation)
Weight approximately 0.6kg
Certification standards CE,UL 508A,cULus,ATEX(Zone 2),IECEx
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