i need some help with this program which is : write a program with ladder diagram for PLC Siemens s7-200 that operates a pump four days in the week (Saturday-Monday-Tuesday-Thursday) and set it off in the three other days (Sunday-Wednesday-Friday) the program should work for good.

hi friend it is very easy i would like to refer one article..which will help you a lot
http://instrumentpedia.blogspot.in/...logic.html
you can download free plc simulator from sourceforge. search for classic ladder