Hi , I am very new to Siemens PLC and working on a program which requires the change in Value of Timer from HMI developed in WIN CC Flexible 2008 . I am using Ladder logic in Simatic Manager and made a code as attached. I want to change the value of Timer T4 which is 10 Sec to the user defined from HMI. Tried to work many ways like i use do it in GEFANUC PLC which is far more easy then Siemens......... Please someone can help me out. Thanks Rajeev