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7/15/2010 3:08 PM | |
Posts: 81 Rating: (1) |
Dear Experts, Can you help me in how to use the local variables set in the step 7 like LW,LB suppose if we are using like that: In FB L LW 4 T DB..... |
7/16/2010 10:10 AM | |
Posts: 147 Rating: (34) |
Local variables are used like any other variables. The only difference is that local variables are NOT available globally (hence their name: local), and are discarded as soon as the routine using them is finished. When using a Function Block, there is already some memory allocated for it, in the form of an Instance Data Block. This means that there is already some memory space allocated for that. Still, the temp variables, are not available in the form of an Input and/or Output. In the Programming with STEP 7 V5.4 Manual (pp. A-24) you can find more information regarding the Local data stack. Hope this helps |
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