MRPLC82
MrPLC Member-
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Posts posted by MRPLC82
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I will be moving for 1 element.
Real value cannot be messaged across directly between PLCs , it has to be DINT to DINT. I have done it a number of times but not sure how to do INT32 to DINT
PLC 1 is 1769-L35PLC 2 is 1769-L33 both CompactLogix
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I need to message across analog value from one controller to second one on site.
I have tried it but message config doesn’t like it.
I never had problems with moving DINT to DINT.
Just this INT[32] -
I could use OTE, that`s an option, I just though OTL would be more robust solution in case of PLC restart etc.
I have got two conditions on rung 1 , when hour is greater than 11 and less 16 to OTE an output. This should work too.
Going back to my OTL option, what was I doing wrong there, OTL and OTU were active at the same time - condition on rung were not permitting it .
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I want to energize it for few hours hence I decided to use OTL. In simple terms when there is 12:00:00 , OTL my output. Output should stay latched until on rung below PLC detects request to unlatch it at 16:00. I hope I explained it well.
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Evening,
I struggle with simple task...
I need to activate PLC Output at the specific time of a day.
I`m using GSV to obtain PLC time, data is being moved to DIN[7] registers.
Then I have three EQU (Hour / Minute / Second) and at the end of rung there is OTL for output.
Rung below I have two EQU (Hour / Minute) to disable output at different time - OTU.
However every time OTL is energised , OTU on rung below is fired too.
What am I doing wrong here ?
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Michael,
Many many thanks, you helped me a lot. After playing with PID yesterday I understand a lot more.
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I need some advice how to tune PID properly.
The PID is only PI type (two mode) and its overshooting frequently. Assuming I need to tune P with starting incrementing by very small steps till PID oscillates.
Once the P is established then will be tuning I , again with small increments till PV follows SP.
So this is my assumption below but would like someone to comment on it as I haven’t had to do it before , been learning PLC for 4 months now.
Do I need to start a machine and then start tuning PID or can this be done in more friendly way , offline ?
Moving INT[32] value to DINT
in Allen Bradley / Rockwell Automation
Posted
I have done some research today and found that COP instruction can not be used in this situation as it will pack two INT tags in one DINT tag.