2/14/2016 2:02 PM | |
Posts: 5225 Rating: (1192) |
What happens when you mouse click on the title of Network 19? |
2/15/2016 2:07 AM | |
Joined: 10/7/2005 Last visit: 9/19/2024 Posts: 3021 Rating: (1054)
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Don't panic guys, there is nothing out of the ordinary happening here. If you want your Block to be displayed with nice solid green border while monitoring its FBD/LAD call online, you must make sure to have the BR bit in the status word set high before exiting the Block (it is the status of the BR bit that drives the Blocks ENO and a Block is only displayed with a nice solid green border if its ENO is ON). Use the "SAVE" instruction to manipulate the BR bit and the easiest way to permanently make sure it is ON is to add the following two instructions to the end of the Block (and make sure to execute these and not have conditional block ends before)
Hope this helps and have a look too at the FAQ What is the meaning of the BR bit in the status word in STEP 7? for more on this. |
Last edited by: fritz at: 2/15/2016 2:10:22 AMCheers |
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This contribution was helpful to1 thankful Users |
2/15/2016 4:50 AM | |
Joined: 10/7/2005 Last visit: 9/19/2024 Posts: 3021 Rating: (1054)
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Hello William All three Blocks (FC23, 24 & 25) are unconditionally called and thus "enabled" and each FC is being executed. It is only their LAD/FBD online monitoring display that shows some of them with a dashed outline simple because the BR bit is 0 when the block call is finished. This is pure online monitoring display "cosmetics" in this case, but would be important if Block calls would be cascaded (e.g. have FC23 and FC24 in one rung and link FC23 ENO to FC24 EN). The reason FC25 has a nice solid green outline is because the BR bit is 1 when the block call is finished (the BR bit is manipulated by a number of instructions, so one can presume that some logic in FC25 drives it on). So while gerard32 was worried about calls not being active, he merely misinterpreted the dashed FC outline during online monitoring as meaning "call not active". P.S: I would argue that the original question was about getting a TRUE result onto the ENO, albeit gerard32 wasn't aware of this when he posted his question |
Cheers |
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2/15/2016 6:05 AM | |
Posts: 5225 Rating: (1192) |
Thank you Mr.Fritz... your expanded notes was very helpful. |
This contribution was helpful to1 thankful Users |
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