Hi, I am configuring Sinumerik One NCU1740 with MCP1900, ITC1900 & IPC427E. My MCP1900 is communicating, white light is on, all keypad inputs like mode keys, Axes keys & free to assign keys inputs are coming in PLC, but inputs from Override switch & X515 & X516 connector are not coming. Outputs of X515 & X516 are getting on with mode change or variable input selection from HMI, although it is not written in logic. MCP1900 is connected on X120 port of NCU I.e. in IE mode. How to configure MCP1800 key colour change & X515 inputs & outputs? Please help in MCP configuration.

Hello 

Manuals für die MCP 

https://support.industry.siemens.com/cs/de/en/view/109962957

https://support.industry.siemens.com/cs/de/en/view/109976477

Example of Use

https://support.industry.siemens.com/cs/document/109794252/sinumerik-one-mcp-commissioning?dti=0&lc=en-WW

How to configure MCP1800 key colour change  ? 

you will find in the TIA online help.
search for  LBP_OpUnitWriteRecord.