The Foxtrot basic CP-10xx modules are equipped with asynchronous serial channels (CH1, CH2), the CIB1 interface, the TCL2 system channel and the ETHERNET interface. Each serial port and logical data channel LCH (one Ethernet interface can serve up to four LCHs) can be set to one of the communication modes and implement various networks and interconnections. Any of the channels CH1 to CH4 in PC mode and Ethernet can be used for programming the PLC, but only one at a time!