interlock diagram ?

Can somebody let me know how to write a block interlock diagram from a flow chart.for plc programming.
any sample project may be helpfull.
i know laddr but not flowchart and interlock diagrams.

Can somebody let me know how to write a block interlock diagram from a flow chart?

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First, you must have the flow chart. Do you have that? If so, look at the flow chart and see where one motor is interlocked or restricted by another motor or device. Then add that to your block diagram. Continue until you have added all device interlocks. (An interlock is simply a control restriction between two devices - #1 must be running before #2 can start, or #1 must stop before #2 can run, and so on).