10/21/2012 12:26 PM | |
Joined: 9/27/2006 Last visit: 9/4/2024 Posts: 12282 Rating:
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Hello dinesh; Many questions on Step 7 configuration and programming can be answered by studying the following manual (you should keep a copy close-by): SIMATIC Programming with STEP 7 V5.5 For example: Chapter 20: Testing with the Variable table 20.8.2 Introduction to Forcing Variables You can assign fixed values to individual variables of a user program so that they cannot be changed or overwritten even by the user program executing in the CPU. The requirement for this is that the CPU supports this function (for example, the S7-400 CPUs). By assigning fixed values to variables you can set specific situations for your user program and use this to test the programmed functions. "Force Values" Window Only when the "Force Values" window is active can the menu commands for forcing be selected. To display this window, select the menu command Variable > Display Force Values. You should only open one single "Force Values" window for a CPU. The variables together with their respective force values for the active force job are displayed in this window. |
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