Offering integrated or optional communication protocols is often a vendor preference rather than a technical limitation.While there are still some high-end controllers that only have a single communication port,many mid-to low-end PLCs(even from the late 1990s to the early 2000s)have multiple built-in communication ports.There are many options for implementing additional ports and communication protocols.
Common Ethernet protocols for PLCs and PACs,including EtherNet/IP and ModbusTCP/IP.These communication protocols provide a convenient way to connect with a variety of devices and systems,including ERP and business systems.Many PLCs and PACs also provide serial Modbus and ASCII communications.These communication methods are popular in barcode scanners,information announcements,electronic scales,frequency converters,temperature controllers,timers/counters and other devices
提供集成或可选的通讯协议，往往是供应商的选择偏好，而不是技术方面的限制。尽管仍然有某些高端控制器只有单个通讯端口，但是很多中、低端的PLC（甚至从1990年代末到2000年代初期），都内置了多个通讯端口。还有很多种选择可以实现额外的端口和通讯协议。
PLC和PAC通用的以太网协议，包括EtherNet/IP和ModbusTCP/IP。这些通讯协议为与多种设备和系统之间的连接，包括ERP和商业系统，提供了一种便捷的方式。很多PLC和PAC还提供串口Modbus和ASCII通讯。这些通讯方式在条形码扫描器、信息通告、电子称、变频器、温度控制器、计时器/计数器和其它设备上比较流行
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