MVI69-MCM
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John Long
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Tuesday 15 November 2005 7:53:43 am |
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MVI69-MCM
Is there a way of adding/creating commands in the master command list without having to download the configuration file? The manual section 2.5.2 Master Driver Mode states "These commands are user configured in the module via the master command list received from the Compactlogix processor or issued directly from the Compactlogix processor (event command control)" I have been unable to find where the master command list is in the Compactlogix processor. I have used the event command control to add commands but find that only one command can be added then you need to wait from the status block (read 0) to be read to see if the command was successful.
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jsanders
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Tuesday 22 November 2005 4:04:30 am |
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RE:MVI69-MCM
You cannot add new commands to the Master Command List 'on the fly'. This list is loaded to the module as part of the configuration file. To change/add/delete commands from this list requires a download of the modified configuration file.
Using Event Commands, you can send additional commands built 'on-the'fly' under logic control, one at a time; but, they will not be added to the normal poll list. They will, in fact, be pushed to the front of the message queue and sent before any normal poll commands from the Master Command List. Be careful with this option! It is a double-edged sword. If you push too many Event Commands to the module over too short a period of time, the module will not be able to execute commands from the Master Command List.
The other option is to use Command Control. In the Master Command List, you can have a mixture of normally enabled and disabled commands. The enabled commands will be polled in order as they come up on the list. Special Command Control logic can be written to execute the otherwise disabled commands from the poll list, as they are need. Using this option, from one to six disabled commands can be activiated for one-shot execution. Again, be careful. This commands also preempt normal polling. Sending too many too fast can stop normal polling.
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