What does the coding mean on M12 connectors?

M12连接器是带有12毫米锁定线的圆形连接器，用于传感器，执行器，现场总线和工业以太网，主要是在出厂自动化应用中。通常具有IP65，IP68和IP69K的评分，非常适合洗涤和腐蚀性环境。

图片由Turck提供

它们提供3、4、5、8和12销。尽管没有计划较高的销钉数，但其他锁定样式（例如刺刀和推杆）仍在开发中。

The M12 family can be found in many applications such as factory automation, measurement and control, communications, food and beverage, transportation, agriculture, robotics and alternative energy.

在特定应用程序方面，用户必须选择正确的PIN计数。对于传感器和电源应用，需要3和4针。Profinet和以太网使用4和8针计数。和田间列，canbus和deviceNet主要使用4和5针计数。最后，为信号要求指定12个引脚。

M12连接器中存在几种编码样式。该编码可防止产品上的不正确交配。此外，大多数编码的M12连接器都可以使用屏蔽。例如，X编码的连接器被其编码的设计专门屏蔽。

The most common types of coding include:

A-coded for sensors, dc power and 1 Gbit Ethernet
B编码用于Profibus
C编码为交流电源
D-coded for 100 Mbit Ethernet
X-coded for 10 Gbit Ethernet
S编码为交流电源（最终将取代C编码的功率零件）
T-coded for dc power (will eventually replace A-coded power parts)

A-, B-, D- and X-coded are most prevalent. This is because the A-, B- and D-coded connectors have been around for a long time and are some of the original M12 connectors. X-coded connectors are becoming more popular for high-speed industrial Ethernet and will eventually replace the A and D-coded parts for Ethernet applications.

AC Power正在开发一个新的代码，即K-编码，而L-编码的设计将很快发布用于Profinet DC Power。

特别感谢Binder USA对本文的帮助。

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