EthereCAT6A M12连接器 EthereCAT6A M12连接器单端口-公端口-直头-X扣-8芯 EthereCAT6A M12连接器双端口-公端直头/RJ45-8芯 EthereCAT6A M12连接器双端口-RJ45/RJ45-8芯